People who drive way under the damn speed limit in school zones. I slow down to the limit every day in two school zones, the first one being 30mph and the second is 25mph. But low and behold, some assholes decide that 30 is too fast, and drive 20mph in the first one. The second one is not so bad, but some people still drive 20 or just shy of 20mph. I call them pace cars, since they're setting the pace for everyone and it's just too damn slow.

Also, people who park in handicapped spots. I know, someone else already said this one, but I sit in front of two handicapped spots in my office. I see people violating all day long and call the local PD to report them. I love it when the police actually show up in time to ticket them (rarely)!!!

People who park in the red zone while their spouse runs inside to do something. Hey asshole, you're blocking traffic, and the curb is RED so move your lame ass!!

People who drive big mothefucking battleships and park them in a "fuck you" way, taking up so much of their parking spot they're actually sticking out into one or both spots on either side of them essentially taking up two or three spots. Love to see that in a crowded parking lot.

People who accelerate so slowly they never even build up enough speed to hit the speed limit before the next red light. And they're always in front of me.

People who don't maintain their vehicles so they belch oil all over the place, or worse, break down and block traffic.