Just a word of warning...
All these ideas are great, at least until they get you killed.
A couple of years ago, when driving near Dallas on I-35 when I was approached by a tailgater obviously suffering from road rage. I followed the steps outlined by Amoeba Protozoa above, and ended up in the ditch after my car was run off the road by the SUV-wielding tailgater.
Sometimes staying alive is more important than revenge.