This is the perfect prank for ruining someone's night! Hide these small, light-activated pranksters in someone's bedroom. When the lights are on, they're quiet, but when the lights go off...that's when the madness begins! Instead of the victim getting some peaceful shuteye, they'll hear an irritating sound! They'll be even more infuriated when they turn on the light and it stops! Either way, it's sure to drive your victim's crazy!