Whoopie cushion

A whoopie cushion is a prank item that is inflated and placed on somebody's seat, with the intention that when somebody sits down on it, it makes a sound like that of flatulence. This item was used in the EMPATH: The Luckiest Smurf story "Days Of Auld Lang Smurf", though the person playing the prank was Jokey's father Pranky and the recipient of the prank was Polaris Psyche.