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 tape over the optical sensor of someone's mouse.
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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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April doesn't fool Chuck Norris, Chuck Norris fools April.
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Paint a bar of soap completely with clear nail polish so it won't suds up.
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