Oh my god..when people leave their dishes in the sink instead of putting them in the dishwasher. I've stood at the bottom of the stairs contemplating leaving the dishes on their beds..but..haven't gone that far yet.
Oh..I HATE when people in non parking spaces. Like at my store, where the walkway from the store wraps around the building, people park there sometimes even though it isn't a parking space. You look lazy as hell and it blocks the walkway.
Or when people drive the wrong way down like angled parking spaces. Aaaack.