If you’re looking for a great way to prank your coworkers, this clever and stealthy USB hack randomly toggles the Caps Lock on and off.
The heart of the hack is taking an old USB memory stick and modifying it so that it presents itself to the computer as a keyboard. Once attached to the computer the fake “keyboard” sends the signal to toggle the Caps Lock every few minutes. Unlike software-based pranks your victim can reboot the computer and the fake USB keyboard will mount again and resume toggling the Caps Lock until it is physically discovered and removed from the machine.
Hit up the link below for additional information and schematics.