lol I had thoughts like the OP before. I thought about riding around in my car with a bottle of milk. If some jerk starts harassing me from the passenger's window I thought about just throwing the open bottle into his car and driving off. Of course I'll never do that though. People say dumb **** because they know they can get away with it. Your best bet would be to just ignore it...but, if they are stuck in traffic (how stupid do you have to be to harass someone while in traffic?) just do what the guy above said and ride slowly past him in the opposite direction while keying his car lol. Seriously people are stupid and sometimes you just have to "teach" them the hard way so the next time they will think about what they are doing.