(adsbygoogle = window.adsbygoogle || []).push({}); kinda have this 'prank war' going on with some family friends (ding dong ditch, etc.)
I have some in mind but looking for some good ideas, mind they have a basketball hoop, 4 or 5 b-balls and usually a bike or 2 in their front yard at night. Nothing too extreme though

Lock the bikes up with your own locks and then send them on a quest for the key.

have sex with his dad.

Put saran wrap over their toilet...

Put the bicycles on top of their roof and tie them down or have them hanging from their house. Not near any windows though of course.

Deflate all the basketballs... if they use them.