When telling a story to two nice German girls you have just met, don't try to demonstrate the throwing action you saw someone do, it may look like a Nazi salute from where they are standing. #LFMF
When the biology teacher is explaining that seminal fluid contains lots of sugars to nourish the sperm, don't blurt out "So why does it taste salty then?". Not only will the teacher treat it as a real question, you will get teased for ages. #LFMF