Move Someone's Car
For this April Fools' Day prank you need to get up early or stay up late. While everyone's asleep move the car around the block. It appears stolen!
When your family members get up and notice the car is gone, they will surely freak out. Maybe they will try to call the cops. Pick a nice moment to announce they've been pranked! April Fool!!!
More April Fool Pranks
Hang up teabags outside someones room. It's excellent to do this to your roommates for an extended period of time, eventually they will lose it! You'll see :)
This prank is funny when you use fake poop. Put a cover over it and tell your kid or roommate there is a bird under there. You have to be quick to catch it.
Plants in your coworker's keyboard
This prank needs some preperation but is really worth it. Your coworker will show up and his keyboard will be full of little grasplants!