I Broke Down
A car breaks down along the highway one day, so the driver eases it over onto the shoulder. He jumps out of the car, opens the trunk, and pulls out two men in long black trench coats.
The men stand behind the car, open up their coats and start exposing themselves to all the oncoming traffic. This results in one of the worst pile-ups.
When the police questioned him why he put two deviates along the side of the road, the man replied, "I broke down and was just using my emergency flashers!"