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Stealth USB CapsLocker
Just a joke for April Fool's Day, but I believe it can be used in some other way.
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.
The CapsLocker was built on an Atmel AVR ATTiny45, and heavily based on theapplication from ObDev. Very little code modification was necessary to get the random Caps Lock activation working.