I can't believe you didn't mention the drivers that INSIST upon driving at or below the speed limit in the left lane of a multi lane highway, rather than moving to the right.
Something else that I always find humorous is when I set my cruise control and play "leap frog" with another car. I will be set at a speed and this guy will come FLYING past me... then I'll catch up with him 2 minutes later and pass him (I'm still on cruise)... then a minute later he will come flying up and sit in my blind spot for a mile... then he will fall back... then he will eventually ZOOM past me again, then slam on his brakes to take an exit. I can't imagine how people can drive in such an erratic manner.