Fill someone's hair-dryer with baby powder.

 709

1  

Hide all of the desktop icons on someone's computer and replace the monitor's wallpaper with a screen-shot of their desktop.

 821

0  

April doesn't fool Chuck Norris, Chuck Norris fools April.

 795

0  

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!

 1478

0  

Paint a bar of soap completely with clear nail polish so it won't suds up.

 699

1