The hot water bottle creates back pressure on the engine. This causes the car to run like crap and lose power. Then when it looks like things couldn't get any worse, a big explosion occurs.
Warning:
Practice with caution. This prank could cause bodily injury.
I spent six dollars for all the supplies I needed for this one. This prank is really awesome, but I will admit It has some inherent dangers. Be careful!
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This prank is on my to do list! :)