PC PRANKS!!

[Bullitt]

If I have the time, I'll take a screenshot of my buddy's desktop, delete all of his desktop icons, then set the screenshot of his desktop as the backround, minimize the start button taskbar, and viola: it looks like his computer is frozen. He can manually restart however many times he wants, and it will never "work" until I show him what happened. (I usually get punched afterwards, but it's totally worth it to see the frustration on their faces).

I also did random pranks on high school kids when I worked for my school fixing the computers. We would remote access some computer a KNI! (known idiot) is on, and randomly close his programs, send em messages, etc. Good times getting back at the little crappers for messing everything up on the machines daily.