The Classic Whoopee Cushion Prank
There's nothing quite like a classic.
Place this under a couch pillow, or someones chair. When they sit down it will make a loud fart sound. Everyone will be rolling in the aisles.
Fart pranks will always be a riot, and the Whoopee Cushion will forever be in style. There's no need for high tech gadgetry to bring laughter to a crowd when this old-school prank is in your joke arsenal.