If anything that shows self-confidence. I love those kinda people. The ones who pick their nose regardless of who is looking.
My fiance biting his nails or picking... and his driving. AND when people drive like fucking idiots. Use a blinker and don't drive like grandpa pants.
That reminds me of another pet peeve that is related to that, is when there is a big group of summer camp kids that get on the bus and take up a big section of seat on the bus while people who have been working all day or tourists who have been on there feet all day from walking around have to stand because the camp organizers are too cheap to tell the parents of the children to contribute like 10-20 bucks each (That's by 15 kids) for renting a school bus.