Fill someone's hair-dryer with baby powder.
April doesn't fool Chuck Norris, Chuck Norris fools April.
Hide an alarm clock in someone's bedroom and set it for 3:00 a.m.
Change the coffee in the office coffee maker to decaf.
Install the Blue Screen of Death screen-saver on someone's computer.
Put a "Please Use Other Door" sign on the entrance to your office building if it only has one entrance.
Paint a bar of soap completely with clear nail polish so it won't suds up.
Place a pair of pants and shoes inside the only toilet stall in a rest room to make it appear someone is using it all day.
Find a sleeping person, fill their hand with shaving cream and then tickle their nose.
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.
I just recently discovered that there is a national holiday named after Atheism. April FOOLS day. Like this story in the name of Jesus.