What about people who, while waiting for an elevator, stand right in front of the elevator doors, and then try to get on when everyone else is trying to get off?

The ones who stand in front of the elevator control panel instead of stepping back so you have to lean round them to push the button for your floor. (Sometimes saying "53, please" like you were talking to an elevator operator works and sometimes it doesn't)

People who decide to start using their turn indicators when they're already halfway into your lane? WHY BOTHER INDICATING IF YOU'RE ALREADY HALFWAY INTO MY LANE!?

The ones who, ignoring the empty road behind me, accelerate to get in front of me, squeeze into the gap between me and the vehicle in front of me, and then brake.

The genius who decided, against all precedent and good sense, that the turn indicators on his cars were going to be the same color as the brake lights.

People who drive Hummers.