ThinkGeek has ushered in a new era of sophisticated office pranks sure to drive your co-workers bonkers while you snicker silently at your desk.

The Phantom Keystroker may look like a harmless circuit board, but it’s actually a devious contraption of unlimited office-based torture. Simply discreetly attach the Phantom Keystroker to any extra USB port on your victim’s computer no drivers needed.

The Keystroker emulates a keyboard and mouse and periodically makes random mouse movements and types out odd garbage text and phrases. A simple jumper setting allows you to choose between either keyboard garbage typing, annoying mouse movements or both. An adjustment pot sets the duration between “events”.