Not quite the same thing as modifying an existing USB key, but there's a nice swath of Atmel USB chips supported by LUFA that could achieve similar effects: Ho

Not quite the same thing as modifying an existing USB key, but there's a nice swath of Atmel USB chips supported by LUFA that could achieve similar effects: Home page: http://www.fourwalledcubicle.com/LUFA.php http://www.fourwalledcubicle.com/LUFA.php Hardware support: http://www.fourwalledcubicle.com/files/LUFA/Doc/101122/html/ http://www.fourwalledcubicle.com/files/LUFA/Doc/101122/html/ (LUFA is what powers the ATmega8U2 that replaced the FTDI chipset on the new Arduino Uno boards.) Stuff something like a Minimus USB or Teensy into a usb stick case, and you're all set to cause endless fun for your coworkers. ;-)