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What are fun Computer Pranks i can use in a Geek-War?

if you know any website, video or anything that explains how to make a little virus/prank please give me the link. or just explain to me what to do? i've already used the one where you take a Printscreen of the desktop, use it as background immage and hide all the icons. i made an endless loop of opening a program too. any fun ideas?

Public Comments

1. put a batch file in the startup folder: shutdown -r -f -t 15 This will give the user 15 seconds to enter the abort command (command line only). Or you could place this in scheduled tasks for a delays effect or a certain time of day. No harm done with this one either.
2. http://www.fslog.com/2007/01/21/javascript-trick-to-edit-the-page-displayed/ I did this for screen shots and my friends lol'd their heads off.
3. HEY I GOT A LOT OF FUNNY COLLEGE PRANK VIDEOS ON MY BLOG. CHECK THEM OUT UNDER THE "PRANKS" CATEGORY. http://askthecollegekid.com/