Put tape over the optical sensor of someone's mouse.
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Hide all of the desktop icons on someone's computer and replace the monitor's wallpaper with a screen-shot of their desktop.
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Install the Blue Screen of Death screen-saver on someone's computer.
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Pull on a coworker is to press ctrl+print screen on their workstation, then paste it into Paint, save the pic, and set it as the desktop background.
Move all of their icons to the trash.
When they get back to their desk, clicking won't accomplish anything!
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Put a "Please Use Other Door" sign on the entrance to your office building if it only has one entrance.
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Q: What did the elf say was the first step in using a Christmas computer?
A: "First, YULE LOGon"!
Fill someone's hair-dryer with baby powder.
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Chuck Norris doesn't scroll with a mouse.
He uses a lion.
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PE Teacher: "Why did you kick that ball straight at the school computer?"
Pupil: "You told me to put it on the Net."
April doesn't fool Chuck Norris, Chuck Norris fools April.
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