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.