Trick Exhaust Whistle
This classic prank has been around for generations, but it still works today. You simply place this little metal tip on the exhaust pipe of someone's car. When they drive down the road the trick exhaust whistle tip causes the car to whistle while they are pressing on the gas pedal. The whistle from the trick exhaust whistler becomes so annoying after a few minutes, but the poor sucker has no idea where it is coming from.
