Another traffic related things that annoys me is when a semi driver going 37mph decides he needs the other lane to pass another semi driver doing 35mph, while driving up a mountain freeway where the speed limit is 65 or 75. Last weekend when going skiing I was a meter away from getting hit when a truck driver randomly pulled out in front of me on a 2 lane freeway to pass, without even using a turn signal. Luckily I was paying attention (I was driving almost exactly 65) and had enough time to apply my brakes quickly. Luckily the next car behind me was far away.
The only other one I can think of is people that touch my screen. I don't mention anything usually, but I clean my screen as soon as I can.