Wow isn't this a prolific post..
What I like to do in situations like this one, especially where there is LOTS of traffic, is just pull up next to the guy and say "Bet cha I will get to work before you" then promptly speed away. Especially during rush hour, there is NO WAY a car can traverse a city as fast as a bike can. This way I still feel better about the situation, and the guy sitting in traffic feels like loser (I hope at least).
Maybe not quite as fun as breaking something, but the result is about the same. Really makes me wonder about people when they pass you shouting and expect not to be caught up with at the next light....
Some people's children....