I'm pretty good about letting stuff roll off my back when driving or riding and not letting it get me pissed off, but the one that gets me EVERY TIME is when I'm at the front of the left turn lane on an unprotected light (rural) and I am waiting for pedestrians to cross to my left before I turn, and I get some spirited honks from 3 or 4 cars back. THAT makes me want to get out of the car, walk back and ask them if they'd prefer that I run over the people rather than wait for them to cross the road.
Haven't done it yet, though. Cooler heads prevail, and all...
"You have enemies? Good. That means you've stood up for something, sometime in your life." -Winston Churchill