I am so jealous that I didn't come up with this prank. A guy's buddies blindfold him walked him out onto the end of a platform, and pretended like they were forcing him to bungee jump.

Here is the best part, he was actually standing about three feet over a pond.

First he didn't want to jump. then he finally did and everyone cracked up when he hit the water. When he stood up and took the blindfold off, even he thought it was pretty funny.