A joy buzzer (also called a hand buzzer) is a practical joke device that consists of a coiled spring 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 that feels somewhat like an electric shock to someone not expecting it. In 1987, Sam Adams' son, Joseph "Bud" Adams, redesigned the mechanism for great durability and a louder buzz, and marketed it as the Super Joy Buzzer.