When you're looking for something, say in a store, and it's literally right in front of your fucking nose and you know that it's supposed to be there because you've bought it multiple times but you somehow don't notice it until you ask a store employee and they point it out to you, and you have no clue how you missed it. I worked at a grocery store for a few years so I know it's not just me, because I've had to be the employee that points the obvious item out a few times, but it still infuriates me when I somehow miss something extremely obvious.
When I used to work at that same grocery store people would always leave their shopping carts right outside the door. For the love of god, it's an extra 30 seconds to just bring it inside with the rest of the carts, are you so damned lazy that putting in that tiny bit of extra effort is too hard for you?
There's a retirement home near the aforementioned grocery store, and since the grocery store is a mom and pop place they offer a 10% off seniors discount on Mondays, so all the old folks would come down from the retirement home to buy their groceries, and that's all fine and dandy. But the problem is that they all walked, so they'd load up one of the half-sized grocery carts with their stuff, buy their stuff, then trundle up the hill to the retirement home with the shopping cart, unload their groceries, and then they'd keep the carts there like they owned them. I get that some of them didn't have cars, or didn't see the point to driving for a five minute walk, but they could at least have one of the employees return the goddamn carts after they used them. We were perpetually down 30 carts at any given time as a result, and we barely had enough carts on a busy day as it was. It didn't even matter if we went up to retrieve them, since by next week they'd have accumulated there again. That really ground my gears during my time there.