why do first class passengers get on the plane first? They sit in the front. Everyone stares at them and bangs into them with their bags as they pass. no reason for it. Tell them to relax , have a drink, and get on last, their seats will still be there.
kids who snap their gum. not just a gentle pffff as it deflates, but they try and snap it as loud as possible, usually in small crowded places like planes, busses, or trains. not just once or twice, but every 20 seconds.
people who leave their garbage anywhere. Have a cup of coffee? just leave the empty cup somewhere. someone will clean it up. There is a level of hell where they will have to clean up garbage for a thousand years per infraction.