Joker's joy buzzer was a prank tool used by the clown prince of crime. It was often strapped to the palm of his hand as a regular joy buzzer. The first version of the tool was placed on the Joker's utility belt, and it was used to stun enemies temporarily. Joker's joy buzzer was a prank tool used by the clown prince of crime. It was often strapped to the palm of his hand as a regular joy buzzer.