Auf so eine blöde Idee muss man erst einmal kommen. Und dann muss man es auch noch tun.

»Just in time for April Fool’s Day! I built a device that has the potential to drive a computer user insane.

This device plugs into a USB port and implements a USB HID keyboard. Instead of doing anything useful, it waits between 30 seconds and 8 minutes and sends the scancode for the Caps Lock key. This will toggle the Caps Lock status on or off. (…)«

(Stealth USB CapsLocker)