The best April fools jokes

Install the Blue Screen of Death screen-saver on someone's computer.
Vote:
has 63.26 % from 41 votes. More jokes about: April fools, computer, IT
Change the coffee in the office coffee maker to decaf.
Vote:
has 62.22 % from 20 votes. More jokes about: April fools, office
Hide an alarm clock in someone's bedroom and set it for 3:00 a.m.
Vote:
has 59.93 % from 25 votes. More jokes about: April fools, time
April doesn't fool Chuck Norris, Chuck Norris fools April.
Vote:
has 53.58 % from 21 votes. More jokes about: April fools, Chuck Norris
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!
Vote:
has 44.46 % from 19 votes. More jokes about: April fools, computer, office
I just recently discovered that there is a national holiday named after Atheism. April FOOLS day. Like this story in the name of Jesus.
Vote:
has 31.68 % from 44 votes. More jokes about: April fools, christian