Here's a free prank idea. The prank costs you $10 in a bet and 1 package of Jelly Belly Sugar Free jelly beans. Bet the prank victim they can't eat these Jelly Beans in 7 minutes. Present the jelly beans in a Zip Lock bag to hide their Sugar Free Nature. They will easily win the bet. Then, somewhere between 20-45 minutes later, they will have explosive diarrhea.