When people tailgate me (i.e. every time I drive anywhere), I start carefully going 3 mph below the speed limit. Sometimes I oscillate my speed 10 mph or so up and down randomly to make the person behind me wear his brakes out. It's not rage so much as enjoyment of punishing bad people. I have a lot of patience.

My father does the "randomly slam the breaks" move when people tailgate him. I imagine it scares the crap out of people.