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What is a good computer prank?

My friend just played with my computer, and it's time for revenge. Any ideas for me?

Public Comments

1. Here is an awesome one. You change his start-up sound to a girl moaning, or something scary, then turn up the volume. Works best in public. And make sure it is the correct format. I think its WAV.
2. http://www.thecoolnews.org/2008/02/16/fake-background-prank/ What you do is change the background pic to a pic of the current background, and then hide all the icons. They click and click on the image without going anywhere!!! Guaranteed to drive them crazy!