I never have good intentions after someone pulls a monumentally stupid move in traffic. Doesn't matter if I'm driving, riding, or just walking to the store for groceries and some jerk almost tags me in the crosswalk. I have a short fuse and an immediate Rage-o-Meter "pegged needle" response, mentally. I don't physically act on it, though. I might honk my Airzound or give someone the finger, but I don't go chasing someone down to pick a fight.
If someone hassles me and then stops to confront me, then it's a different story. If a driver wants to pick a fight with me, I will do my best to end it quickly.

I will admit to a couple opportunistic retaliations, though. A guy thought it would be a funny idea to pull over and block the bike lane since traffic was all bunged up and I was going to pass him. So I stopped, got off my bike, and pressed a narsty butt-print on his passenger window before remounting and riding off.