This is one pretty funny and cruel prank. A guy rigged his friends truck so that every time he presses the brake pedal, the horn goes off. That means sitting at a traffic light, dude is blowing his horn the entire time. He doesn't take long to pull off the side of the road to turn the truck off, but not before he ticks off a bunch of people who think he's blowing their horn at them for no particular reason.
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