Use a mannequin head and place it next to your partner while they sleep. Wake them up and as they try to look at you they freak out as they see the fake head.

This is a great joke to trick your colleagues and this one is deviously simple. You only need a piece of tape.

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!