Ever wanted to prank one of your co-workers? The Phantom Keystroker is your big chance to do so. It resembles a circuit board, but it's really a device of destruction. Well, it can destroy an unsuspecting co-worker's day anyway.

Here's how it works: Attach the Phantom Keystroker to any free USB port on the victim of your choice's computer. The Keystroker is said to emulate a keyboard and mouse and will perform random mouse movements and type out unusual text and phrases on his or her computer. This is the point when your victim will start freaking out and probably call IT.

You control whether you want the device to randomly type weird phrases, perform annoying mouse movements, or both, thanks to the "Jumper" setting. The Phantom Keystroker is compatible with any OS and sells for $24.99

Ultimate Office Prank: Phantom Keystroker