All the above plus:
Drivers who don't use their turn signals - should be shot!
Rude drivers - try to take me from the shoulder or try to jap me out after waiting on a busy exit ramp. Notice key word here is try! Hello, is your time more important than mine - don't think so.
Or multiples of the above list Jay gave. I had a guy in a Lexus in front of me one morning, holding up the entire parkway. He had the cell phone on his ear, the newspaper open over the steering wheel and an electric razor in his other hand. Get your sorry ass out of bed earlier and do what you have to do. Same goes for pretty girl putting on her makeup as she drives.
How's about the moron that insists on driving right next to you, steering wheel to steering wheel when the roadway is empty. You speed up, he speeds up.