change lanes without looking, even worse when more than one car merges on a 6 or 8 lane. People who refuse to do the simplest of tasks are usually the jerkoffs who cut too close and change lanes without judging distance.
Sound the horn and they get their little panties in a wad. EFFF'em, fine the bastas and let them pay $250 for some driver education. And screw the ACLU for taking sides with idiot drivers too, it happens all the time.