Dailies - 101008
I was waiting for the traffic light to turn green when some JB biker dude knocked into my side mirror. He regained his balance on the bike, then weaved through the heavy traffic, and disappeared. Even before I could yell FUCK!, get out and confront him.
Thankfully, no scratches.

It's like that one.. When I was still riding, there were several instances when I accidentally gave a little bump and my initial reaction was to speed away. ;)
For me, if the person doesn't say sorry or even a gesture (worse case, still stare) I will get out of my car.
Thia ia the exact reason why everyone should carry little rocks in their car's ash tray. If Jessie is with you, all the better. Lets play, stone the biker!! :D