Reading all of your responses makes me feel better.
My addition: Those who crowd the intersection, blocking all of those (namely, me) from making a left turn. There are two very busy intersections near where I live. BOTH intersections will fill with cars waiting to make left-hand turns (one with cars going one direction, and the other, a block away, with cars going the opposite direction,) but neither directions can until the other direction clears - what's known as a stupidly vicious cycle.
If the small length of road between the two busy left turns is filled, I stop at the green light and let those waiting to turn left go. I've had idiots lay down heavy on the horn and pass me and flip me the bird, only to stop directly in front of me, blocking the intersection.
This usually leaves me waiting even longer, most times through ANOTHER red light, enraged to no end. The worst part is when my light changes to a mocking green turning arrow, but I can't go because the intersection is still filled with cars.
It simply makes no sense to me why people do this. It makes so much more sense to leave the intersection clear and allow a sensible gap while you wait for your turn to go. I hate to admit it, but when it's really bad and I feel as if I might be caught waiting through TWO red lights, I inch forward and lay on the horn to prevent the intersection-filling-goober from blocking me off again.