How to Prank a friend who is working on a car

This prank is not for the faint of heart. It will hurt your victim a great deal, and likely make them want to visit the same fate upon you. But if you're really trying to find a prank that will make the day of your victim worse, and they like to work on cars, this prank is for you. All you do is wait till your victim is under a car working, then grab a hammer and...