When driving, what gets the most in your nerves?

Aside from tailgaters, which I think we can now declare to be universal, I've a few pet peeves of my own:

When two people are going the same speed, right next to each other, in different lanes, preventing anyone from passing either one of them and backing up traffic for a lightyear.

People who rubberneck at a minor traffic accident or pull-over, slowing down to 25 MPH in the missle of rush hour.

People who hit the gas when you try and pass them. The turnpike isn't the Indy 500, and letting someone pass you does not automatically mean that you have a tiny penis. Thank you.

My number one pet peeve is when people make rude gestures or faces, at me or anyone else. Whether they have cause or not, it's the last thing people need on the road, and drivers bust out the deuces for the most trivial things. Plus, in this state, you never know if someone may be armed.

Jam it back in, in the dark.