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What is great computer prank to pull on a friend?

My friend is a huge computer nut, so I decided to try and prank him with on one. Any suggestions?

Public Comments

1. hold down ctrl, alt, and the down arrow it should flip the screen over but not damage the computer when you want to change it back do the same thing but with the down arrow It wont work on apple computers :]
2. you can pull all of the letters off his keyboard and stick them back on the wrong order. there's an option in word to change a word to something else whenever it's typed. I can't remember what it is now though, I had a lot of fun with that one
3. i cant think of nothing sry
4. http://www.youtube.com/watch?v=hjkUC9KZWMg Lol i want to try it sometime.
5. Get into his Outlook and add a signature that says something embarrassing. He may get some interesting responses to his next e-mail. "I'm wearing womens undies and manacles - phone me now on *** *** **** if this gets you hot!"
6. This one requires some setup, but it's awesome. We did it to glen in Grade 12. 1. get their laptop when they're not looking 2. go into sound properties, and see if you can disable the sound dial on the laptop. 3. For the startup sound, replace the normal sound with a pre-recorded porn video sound in WMV format. 4. disable all volume keys, leaving the volume at maximum. 5. turn off the laptop, and wait for them to go to a library or somewhere public. When they turn on their laptop, the porn will sound loud and everyone will watch in horror as they think he's watching porn while he frantically tries to silence it. lolololololololololololololol