The insanity alarm is made to give off an annoying sound in the dark, but once a light hits the sensor, it will stop. It's the perfect device to drive a teacher, or fellow office worker insane, or get back as a prank. If you put it in someone's desk drawer, or a closet, and when they close the drawer, or tern off the lights, the alarm will go off untill the drawer is opened or light is terned back on, then the whole thing will be repeated.
