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What are some good computer pranks for the office?

I'm looking for pranks I can pull on my co-workers, like changing the settings on their computers when they get up for coffee, nothing that will harm the computer or make them loose any work, just something to freak them out for a minute. Here are some of my ideas: Change the text color on their document to white, making it look like they lost their work. take a screenshot of their desktop background, save it as their new desktop backgound, disable the icons (the icons will still show up but they will just be part of the background picture) and watch them freak out when icons don't work Install a wireless mouse and click randomly while they think their computer is possesed. save a picture with the words "Your Fired" as the desktop, then when they return say "(bosses name) was looking for you, he seemed pretty pissed off, then he sat down and did something on your computer, any idea what it was all about?" Anyone think these are funny and do you have any more ideas?

Public Comments

1. Check out this article, and don't forget to scroll down and click "Comments" to read the discussion that followed. Many of the comments are way better than the main article itself! http://worsethanfailure.com/Articles/Hacking_Made_Easy.aspx But whatever you do, just make sure beforehand your target can take the joke, and the instant they start to get panicked or angry in the slightest you explain what you did and show them how to undo it.