Back when I was 17 or 18 when I bought my first bike on my own, I had also purchased a blue book on bikes to learn how to maintain it and other stuff.
One quote I remembered from that book was that New York cabbies are the bottom of the barrell.
Sometimes, when driving, and I see a cab trying to make a u-turn, I feel like I want to be an a**hole, I'd drive up behind him forcing him to get stuck and block traffic from the other way.