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One of the funniest gotchas ever devised!
Stick this little metal whistle clip into their tail pipe.
When they start their engine the whistling will start. The more they step on the gas, the louder the whistle!
They will really think something is terribly wrong with their car.
Just don't take it too far! Don't let them wind bring it to the shop for repairs! Time from their schedule to bring it there plus about $100 for an hour for labor... Well, that just wouldn't be right. Although most people will eventually figure out the "problem" on their own.
Adjusts to fit most exhausts.