'This is going to be a $7,000 lesson for you': 15 Workers whose clients, customers, and bosses saw their big mistakes

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Remy Millisky • Writer and Editor
Sep 10, 2025 5:00 PM EDT

When you make that huge mistake, you just have to hope that no one saw it. Maybe you dropped a milkshake everywhere, and you're realizing that tons of customers and coworkers are staring at you. How mortifying! The only thing that could make that situation worse is if you happened to drop it on a small child… who was celebrating her birthday… leaving her totally soaked in milkshake. Yep, that happened to one person here, as people shared their stories of their most mortifying workplace mistakes ever. 

It's honestly surprising that waiters and waitresses don't drop food more often. They can carry a dozen plates at once, or an entire tray of drinks, without ever dropping it (well, most of the time, anyway). Kudos to them for their impressive ability to hold a platter just so, avoiding dropping people's lunches all over the ground. 

I mean, don't cry over spilled milk(shakes), food can be remade. But some of these workers had jobs in other sectors, where they were working with equipment that cost hundreds, thousands, or even millions of dollars per mistake! The stakes are much higher in a job like that — just ask the dude who got a rush job to make some semiconductor pieces, and ended up melting them instead, costing over a million dollars. If you could survive that mistake without getting fired, you deserve a gold medal!

Check out a bunch of workplace mistakes down below, and then read about this employee's strategy to replace a 24/7 surveillance system on their computer with a broken file: "I'm probably not gonna get fired." 

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  • 01

    "What is the worst thing you've ever done at work?"

    Person with outstretched arms dropping 2 out of 4 coffee cups from a carrying container with coffee shop background containing 3 people
    via Kyle Ryan on Unsplash+

    The image does not depict the actual subjects of the story. Subjects are models.

  • 02
    Enfrique I worked in a facility where we tested wafers of semiconductors. For some of the wafers, the process was: • Test on a machine • Put the wafers in an oven for a period of time • Test on a machine again
    via u/Enfrique
  • 03
    Then the wafers would go out to be cut and used. The wafers would come to me, post-testing, in a plastic carrier that had twelve slots. The carrier was in a box with a latch. So I would open the box, put the carrier on a machine that would transfer the wafers from the plastic carrier to a metal one. Then the metal
    via u/Enfrique
  • 04
    carier goes in the oven. No problem. One day, my supervisor comes to me with a carrier with three brand new prototype wafers in it. No. box. He says, "These have to go in the oven immediately!"
    via u/Enfrique
  • 05
    So I put them in the oven immediately. Since I didn't have the box to open, my routine was broken and I did not transfer the wafers to a metal carrier. "Hey, man, do you smell that?"
    via u/Enfrique
  • 06
    The plastic carrier melted in the oven and adhered, very well, to the silicon wafers, which then cracked in many places. All of this rendered the fancy new, super-high priority wafers totally useless. TL;DR: I'm such a creature of habit that when my process didn't start the way I expect it to I blew 1.2 million dollars in under two hours.
    via u/Enfrique
  • 07
    Man in black hoodie and red pants about to drop 5 boxes
    via Josué Sánchez For Unsplash+

    The image does not depict the actual subjects of the story. Subjects are models.

  • 08
    hydraosamahasris... I work at a grocery store. One of my coworkers is deaf in his left ear, and this dumba b painkiller'd out was on his left side, yelling at him to give her bags of ice from the freezer. He didn't hear her until she was yelling obscenities at him and calling him retarded. She then decided to just ask me for help. I politely obliged, already
    via u/hydraosamahasrisen
  • 09
    scheming as to how I was going to ruin this b's day. She asked for 10 20 pound bags of ice, so I filled up a cart and brought it to her car. She sat her ladwhale a down in the front seat as I loaded them into the trunk. We carry boxcutters with us at work, so i decided to use mine to rip open every single bag i put in, so that when she attempted to pull them out,
    via u/hydraosamahasrisen
  • 10
    the bags would come out, but the ice would stay. She showed back up at the store in a rage, the likes of which I had never seen before. Apparently she took a while to get home (I live in Las Vegas too, so it's super hot), and the ice melted, hit some open wiring in her 2002 Ford Taurus, and completely f ed all the electronics in her car.
    via u/hydraosamahasrisen
  • 11
    My manager told her tough. luck, and that she wasn't on our property when the damage was done, so she lost her sh, started I screaming and throwing sh for like 45 minutes straight, started hitting me, then got escorted away by security. All in all, probably the most interesting day of work that I've had.
    via u/hydraosamahasrisen
  • 12
    lalaino At work we communicate through skype. There was a coworker i kinda flirted with. We would ask each other questions, and the other person had to answer honestly. I asked the guy whether he had chesthair,
    via u/lalaino
  • 13
    but instead of sending it to him, i sent it to my boss. Fortunatly my boss laughed it off and told me to go back to work. I still cringe at the memory
    via u/lalaino
  • 14
    dangerousbrian I forgot the WHERE clause on a update query and there was no backup
    via u/dangerousbrian
  • 15
    Scattered items from a dropped bag onto stairs, headphones, coffee mug, sunglasses, reading glasses, 3 books
    via Eduardo Ramos For Unsplash+

    The image does not depict the actual subjects of the story. Subjects are models.

     

  • 16
    ere... When I was a teenager working as a meat packer, I discovered in the meat I was sending to the conveyor belt pieces of metal, the glistening caught my eye. After closer inspection I noticed more larger bits, through about 150kg of meat of various cuts and all coming along the line, at a fast rate. I hit the emergency stop on the packer as
    via u/erehgafsua
  • 17
    obviously there was a major problem, this meat was being taken directly to the sales floor, apparently the butchers didn't see it that way. After a fairly heated discussion/inspection, it was quite obvious the guard of the band saw, had migrated and was shearing off portions of teeth. There were almost full 6mm shards of tooth through a whole
    via u/erehgafsua
  • 18
    heap of meat, packaged and ready to be. I was expecting a manager to get called in, everything inevitably getting dumped (as the pieces of metal ranged from large to specks) and us having play catch up all day. No. The butchers wanted to go home (as they had been cutting since 4am), ordering us to remove it all by hand.
    via u/erehgafsua
  • 19
    There were hundreds of packs we had to take off the shelf, un-wrapping each and inspected meticulously, though no one could have removed it all. I shudder to think what would have happened if someone had swallowed one of those teeth. I still feel guilty I didn't alert a manager, but the butchers were all gassed out of there minds and would threaten
    via u/erehgafsua
  • 20
    you with a wave of their knife if you questioned anything. I was young and stupid. So many fond memories, like did you know, if you accidentally send a bag of meat through the mincer still in the plastic bag, apparently it is cool to just mince it on a finer grind so the customer doesn't notice? I shockin sh went on there.
    via u/erehgafsua
  • 21
    Sarcastic Panda When I was younger I was an auditor for a hotel rewards program. Basically, my job was to spot fraud and ab e and prevent it or stop it. My routine consisted of spotting trends, notifying our guests and asking for explanations of their activity and negotiating penalties with them.
    via u/Sarcastic Panda
  • 22
    Now, I had a woman who I stumbled across by accident and she was guilty of major fraud and she was good. She had accumulated around 4 million points through her scheme. I sent her an email and letter asking her to call or email me to discuss her account and put an account freeze so she couldn't use her points. She didn't respond after a week, so I sent her another email and called her
    via u/Sarcastic Panda
  • 23
    and she promptly hung up. on me. This went on for a solid two months. She had a trip to Paris booked and she was planning on using her points for this, which she can't do because her account is frozen. Also, because this is a sister company hotel, they must have the certificate in hand or pay. So she gets there, enjoys her week stay and it comes time to check
    via u/Sarcastic Panda
  • 24
    Person with outstretched arms dropping 2 out of white coffee cups from a carrying container
    via Josué Sánchez For Unsplash+

    The image does not depict the actual subjects of the story. Subjects are models.

  • 25
    out, well, the hotel wants to be paid. She calls into customer service and pitches a fit and they can't help her because of the freeze I've placed on her account. The CSR calls me at home and I come in and call the hotel and finally speak to her. Her: They want to be paid, I need you to overnight a certificate to the hotel.
    via u/Sarcastic Panda
  • 26
    Me: I can't do that, I've suspended your account because you've abused our program. Her: Yes, you can, look, they want $7,000 or the certificate. Me: I've been trying to contact you for the last two months and you have chosen not to respond to me, we can discuss your account now if you'd like
    via u/Sarcastic Panda
  • 27
    and we can compromise and I'll talk to the hotel. Her: No, you need to just give them the certificate, I'm not going to discuss anything with you, you should be happy that I'm spending all the time in your hotels. Me: Look, it's Saturday morning, I don't want to be in here discussing this with you and it's not you that's
    via u/Sarcastic Panda
  • 28
    been in our properties, it's been friends and coworkers. You've blatantly abused our program and it costs us money. Her: F you, you don't know who I am, I will be calling the CEO and getting you fired, you're just a loser who thinks he's important, now, you get the certificate here and maybe I won't get you fired.
    via u/Sarcastic Panda
  • 29
    Me: Ma'am, I don't know you but your threats don't scare me, so here's what's going to happen: I've zeroed out your account, your guest status has been stripped and I've closed your account, we do not want your business. Thank you for your time. Her: WHAT?!? They are going to charge me $7,000!!!
    via u/Sarcastic Panda
  • 30
    Me: Had you been nicer to me and responded to me, we could have settled this. As it is, your attitude has prevented me from being willing to do anything for you. Her: Look, I'm sorry, I don't have $7,000. Me: That's not my problem, guess this is going to be a $7,000 lesson for you. /hangs up phone
    via u/Sarcastic Panda
  • 31
    Ended up with a presidential complaint but nothing came of it.
    via u/Sarcastic Panda
  • 32
    Tee... I worked at a coffee shop and was used to ride customers, but this one guy seriously took the cake. He deserves what he got. This man placed his order at the speaker asking for a macchiato I ask if he means a caramel macchiato (completely different but more popular drink) and he says no. So I give him his
    via u/Tee-Chou
  • 33
    total. Eventually he gets to the window, pays and I hand him his drink where he proceeds to completely lose his sh. he tells me that me this is NOT the drink he ordered and I'm a complete idiot..etc etc. Come to find out...he ACTUALLY wanted the Caramel macchiato. This happens often so I told him we wouldn't charge him the
    via u/Tee-Chou
  • 34
    extra and I'd have it rushed out. This isn't good enough for him. He grumbles about deserving to get his money back AND the new drink...but I politely excuse myself from the window until the drink is made. My barista finishes the drink and I hand it to him. He grabs it from me and drives
    via u/Tee-Chou
  • 35
    forward. But he's not done yet. I'm talking with the next customer when this guy stops his car, gets out, and walks in between her car and my window. He leans in the store and hollers that this STILL isn't his drink; he wanted it iced. I ask him to come in to the front of the store since I can't serve him like this, but no...he'd rather stand in front of this lady.
    via u/Tee-Chou
  • 36
    My coffee shop had a policy where we COULD NOT say no to a customer. I sometimes wondered if I would be expected to service someone sexually, as long as they asked while I was behind the register. I asked my barista to make the caramel macchiato again, but iced, and as fast as freaking possible.
    via u/Tee-Chou
  • 37
    I had gone hide from this man again, but he begins yelling so I come back. Now he's saying that he ordered and payed for a Cream cheese muffin. I ask to see his receipt so I can show him that he didn't pay for one, and that we had been out of cream cheese muffins all morning. But he refused to show me his receipt. I'm trying to reprint the previous order but he's yelling and my manager has made it
    via u/Tee-Chou
  • 38
    clear that she's not going to help at all. So I say "f and go to the pastry case and grab whatever kind of muffin we had. "I Just as my barista hands the new latte to the crazy man | hurl the muffin through the window and hit him in the chest. It gets muffin all over his shirt and say "I'll Comp it for you!"
    via u/Tee-Chou
  • 39
    I was actually shocked when he quietly took the muffin and his now 3rd drink and walked back to his car. The lady, who had been sitting stunned in her car the whole time, actually said "well done." to me. TLDR: I threw a muffin at a customer.
    via u/Tee-Chou
  • 40
    briceiron Wrote and published two books on company time. I was an extremely dedicated and hard working individual in an engineering environment. I achieved nineteen patents among other accomplishments. In 1999 my son d d in a terrible accident (cold case.) I was an exemplary employee through the traumatic experience. At
    via u/briceiron
  • 41
    performance review time I received low marks as usual. (The company needed to save money.) When I pressed my boss for reasons for the low marks he beat around the bush. I continued pressing. He said "because you had that funeral." The uncompassionate reasoning blew my mind. I decided then and there to contribute as minimally as possible to his success. He may have
    via u/briceiron
  • 42
    been the college educated boss but that did not make him the smarter of the two of us. I still miss my son. I still wish my boss minimal success when I think abut how cruel people can sometimes be. Now happily retired. Life is good.
    via u/briceiron
  • 43
    awan001 Literally 5 minutes ago, I squirted a policeman with a water pistol out of my office window.
    via u/awan001
  • 44
    [deleted] I used to work in a law firm. I left a file in mail room and mail room sent it to the opposing side. I no longer work in a law firm.
    via u/[deleted]
  • 45
    Pg2... While working at a national accounting firm of 2,000+ employees, I e-mailed a picture of a kitten to the CEO, every Partner/head honcho I knew, and my co- workers late at night. Alc ol was involved. No one ever reprimanded me. I left the firm (for other reasons), but from what I hear people still talk about it.
    via u/ Pg21_SubsecD_Pgrph12
  • 46
    elmatador12 I was working at an extremely busy gas station. with a line out the door. The woman came in going right to the front asking for directions. I said I would be glad to help her, but let me get through these paying customers first. (I was the only one there, and this is before google maps).
    via u/elmatador12
  • 47
    Well she would not stop yelling about it and interrupting. So finally I asked where she was going. She said the name of a mall that was literally down the street. I gave her directions to another mall 20 minutes away.
    via u/elmatador12
  • 48
    All the customers watched and listened to me give these wrong directions. When she was in her car driving away, the 10 or so customers I had in the store gave me a resounding applause.
    via u/elmatador12
  • 49
    [del... When I got my first summer job I had a hardass manager who pointed out every minor detail about how the job should be done, and he did this repeatedly over the course of an entire summer, just drilling it in to my head. Well, for some reason they liked me and wanted me to come back the following summer. And that manager didn't work there anymore,
    via u/[deleted]
  • 50
    and the other summer workers was completely new, I was the only one who had been there before. So I actually positioned myself as the manager and ran operations for the entire summer, being just as picky as the previous manager. Funny story is that the regular staff (the ones that was there year round) didn't mind that I did this, and they came to me and said: "This
    via u/[deleted]
  • 51
    guy isn't doing anything, can you go and tell him to do his work?" I didn't even have to say anything, I just walked over there and he started working when I was around. They all flipped at the end of the summer when I revelead that I was just one amongst them and that I didn't ever had any authority over them.
    via u/[deleted]
  • 52
    And I had been sending people home when they disapointed me, saying that I was going to dock their pay and stuff like that, which of course I couldn't do. TL,DR Pretended to be the manager at my summer job
    via u/[deleted]
  • 53
    gatsbygirl93 I used to work at Kmart and this old lady who had a mental illiness, always came into the store and buy a f ton of cans of cat food. When I would ring her up I wouldn't scan but maybe 10 cans. She was so sweet to everyone and kmarts prices were way to high for everything so I gave her free sh all the time.
    via u/gatsbygirl93
  • 54
    roastbeefandtoast Worst thing I ever did, ever in my life, was when I worked at a cafe. I was running out orders and bussing tables, and I was just learning how to hold the tray properly with my left hand. So I get an order; one cappuccino, one strawberry milkshake, for a mother and her little girl. As I get to their
    via u/roastbeefandtoast
  • 55
    table, I put the coffee in front of the woman, then unbalance the tray and accidentally spill the milkshake. All over this seven year old kid. It was her birthday and they were her new clothes and shoes. Man, even her feet were just swimming in milkshake. Horrifying. Tl;dr: accidentally poured milkshake all over a kid on her birthday.
    via u/roastbeefandtoast

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