...to run over pedestrians.
The situation: you're in your car at a red light. Pedestrians begin to cross in front of you. The light turns green. An oblivious pedestrian steps off the curb, then notices the light is green. He/she speeds up for a step or two...and then WALKS the rest of the distance in front of your car. You couldn't spare the extra two steps of jogging to get FULLY out of my way, you jaywalking troglodyte?
If you have exhibited this behavior before, beware, as notice has been served. I WILL run you over.

On the Sunset Strip, they have pedestrian crossings in the middle of blocks in some places and evidentally you are supposed to stop for them. At least, that's what the cop said when I was pulled over. Ended up taking pity on me since I wasn't from LA and just gave me a fix-it ticket.
My beef isn't with pedestrians in the crosswalk... it's the fake "oh, ok, I'll hurry across" thing that annoys me. Just jog the whole way and we're cool.