I hate people who don't know the rules of mass transit. They suck.

Elevator etiquette! It should be taught in schools, dammit. Drives me insane when some nimrod gets on, plops him/herself in the middle of the car and does not move, no matter how many people are getting on (and have to flow around said nimrod) or are getting off (again, having to move *around* this imbecile).

Aiii! Aiii, aiii, aiii!