The best April fools jokes

Install the Blue Screen of Death screen-saver on someone's computer.
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has 61.50 % from 42 votes. More jokes about: April fools, computer, IT
Change the coffee in the office coffee maker to decaf.
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has 60.15 % from 22 votes. More jokes about: April fools, office
Hide an alarm clock in someone's bedroom and set it for 3:00 a.m.
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has 57.16 % from 26 votes. More jokes about: April fools, time
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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has 55.11 % from 30 votes. More jokes about: April fools, computer, office
April doesn't fool Chuck Norris, Chuck Norris fools April.
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has 52.49 % from 23 votes. More jokes about: April fools, Chuck Norris
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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has 31.78 % from 71 votes. More jokes about: April fools, christian