I can't stand the people who take up an entire hallway or aisle. They either have a shopping cart or are a beached whale and can't move off to the side. Then I ask politely and they are like "well um i'm trying to do something so you can wait." The ones that really piss me off are the ones who talk to in groups and stand in the middle of a hallway. So offtopic what pisses you off? Post down below