I have alot of really dumb pet peeves.
I can't stand when the last person to use the shower in my house leaves the curtains drawn. I don't know WHY, its so stupid, but I just like them to be open so that I can see behind them I guess.
It also drives me nuts when people are extemely messy and leave trails of garbage, dishes, etc as they move through rooms in the house. I am no neat freak, but I just hate having to pick up after everyone when I want it to be relatively clean.
I have loads of other pet peeves that I just can't think of at the moment, but I will post them as they come to me.