Parties are draining. It seems like the second you agree to go to a party, even if it's weeks in advance, the energy in your social battery starts to deplete. We all know how slowly that social battery recharges, so it's simply a rare commodity to have in your back pocket, especially when you're at Trader Joe's and you're expected to make small talk about cheese with a strange 20 year old with an unnatural smile. If your social battery is empty in that critical moment when your groceries are being bagged, that cashier is in for the meanest, most unashamedly hostile look he's ever seen. It's not your fault though, you went to a social gathering 3 weeks ago, so you still have nothing left in the tank for pleasantries.