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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Install the Blue Screen of Death screen-saver on someone's computer.
 827
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Take a squirt gun into the rest room stall next to someone and shoot little drops over the wall every couple of seconds while pretending to pee.
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Fill someone's hair-dryer with baby powder.
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I just recently discovered that there is a national holiday named after Atheism. April FOOLS day. Like this story in the name of Jesus.
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