Just pulled a prank on one of my roommates
Ok, this is kind of dumb, but it was funny. I captured a screenshot of his Desktop and saved it. I set his wallpaper to that screenshot and auto-hid the Taskbar. He tried to use it and was wondering how come he can't open his files or do anything!!! He came to me because I was like the local computer guy. Haha, so funny. His reaction was priceless.
*Fact: Microsoft Window's Blue Screen of Death vs Computerforums.org's White Screen of Death. Which is worse?