This prank is one to build up to April Fools Day. Every time you are near someone leave pennies / small coins without them noticing.

This one is great to fool your kids. When your kids are asleep the night before April Fools day you use food coloring to turn the milk in the carton blue!

This prank needs some preperation but is really worth it. Your coworker will show up and his keyboard will be full of little grasplants!