Im sure you've all heard of this one before, but maybe slightly different. You've all heard of the 'water bucket above door prank', but its most likely its not possible to do that in your house because the water would go everywhere.
So here is a cleaner, and easier alternative!
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Step 1: Grab some tennis balls
You will only need about 5-8 tennis balls for this prank.
You can get tennis balls at the store for about 50c each or about 25p.
Step 2: Preparing
Open the door about 1"-2" or just enough so the end tennis ball wont fall through and lay the tennis ball at the edge like in the picture.
Step 3: Add more on!
Begin slowly placing more and more tennis balls along like in the picture
Step 4: Almost done!
It should look like this when you have all of the tennis balls along the top of the door
Step 5: A few notes
You will only be able to fit a certain amount of balls on the door.
In this picture alot of balls fell off the door because there were too many on there!
Try and fit as many on as you can, but dont be too ballsish! (Pun intended)
Step 6: Now wait!
Wait for your victim to walk through the door or just shout them through to the room you're in and watch them get showered with tennis balls!