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

Aprils Fools' Day prank: Ripped pants. When you are near your mom, drop the pen to the ground. As you reach down to grab it, it seem you rip your pants.