I see things and hear things like this from time to time and aside from deeply disturbing me, it completely baffles me. How is it that someone in a car feels so threatened by a cyclist that they can become enraged? Is it that you have the perception that cyclists are somehow slowing you down?
One night on my way home I actually had a guy in a 'pimped out' import pull up next to me and start revving all four cylinders. Really?!? Posturing to a guy on a bike? With your car? Maybe it's the fact that with hundreds of horsepower you're still slower than me, and I doubt you're having a good time in that rolling metal box. Or, maybe it's the fact that drivers are vastly in the minority and all that insecurity from being too weak to pull your own weight is just too much for you. I keep vacillating concerning gas prices, but assholes who think there's a good reason to try to kill someone with their stupidly unnecessary car make me wish gas was twenty dollars-a-gallon.
I hope this guy goes to jail for this. If you're weak enough to drive a car every day, at least take some responsibility for your slovenliness.