This is amusing when I'm awake, but perturbing when I'm asleep. Found a nifty tool that will lock the keyboard, mouse, and drives until you type in a customizable passphrase. With a minor tweak of the settings, I can even continue watching shows without worrying about the potential havoc if I go to sleep. If you have cats or kids, you might want to give this little bugger a try.
http://download.cnet...4-10305344.html