Playing pranks is a captivating activity, isn't it? So, I would like to offer you my cool idea of a prank! It deals with a car.
Buy artificial scratches for a car. (It's sold in special stores or shops of funny things). Then choose a victim - it may be your friend or any strange with a car. Stick these scratches to a car and then you have different ideas how to behave further. If you also have car you may play as if you accidentally came across on the car… If you don't have it, you may simply come to the victim and say to him/her that you just saw how somebody scratched the car…. The owner will be shocked, disappointed and awfully upset… So, don't torment him/her for a long time and make confession that it's just a prank! Let he/she doesn't worry and if it's happening on April Fool's Day say that he/she is just an April's Fool!