A joy buzzer (also called a hand buzzer) is a practical joke device that consists of a coiled mainspring inside a disc worn in the palm of the hand. When the wearer shakes hands with another person, a button on the disc releases the spring, which rapidly unwinds creating a vibration which mimics an electric shock to the unsuspecting victim.[1]
- ^ Soule, Gardner (January 1955). "Fun's Henry Ford is Still Inventing". Popular Science. 166 (1): 123. Retrieved 18 December 2018.