The joy buzzer is a gray bracelet with a red button in the middle that triggers the electroshock. Anyone who shakes hands with somebody wearing a joy buzzer then presses the button and receives an electroshock.
Role in episode
The joy buzzer is first tried by Patrick when he and SpongeBob are at the Palace of Pranks, looking for the best novelty item in stock. Upon being introduced to the store owner, Frank, Patrick shakes hands with him and gets shocked by this device. Frank tells him that that's his first lesson and deems it the "grandaddy of all pranks."