Heh, Reminds me of a prank I pulled one time. I was working as a debug tech, and I had a bench back to back with another tech, I reached under the bench and plugged a USB keyboard and mouse into his PC. I started hitting random keystrokes every now and again when I heard him typing, Then when he'd turn his back I'd hit the windows key or alt+F4. When he was trying to use his mouse I'd move mine around slightly to give him a case of "Drunk Mouse" He got really upset. But it was all in good fun. After a while he thought it was a pretty good prank.