So my brother, my friend, and my neighbors VS some other neighbors
Haha, we do this all the time! I recommend prank calling them with a prank app (or use the recorded voices from the app and call them with an anonymous number). I called my friend and sent her a "singing telegraph". It was hilarious!
If it's a hot day and you guys don't mind getting wet, get wet!
You can also print a lot of pictures of something they hate or something and stuff their backpack or desk with it.
So many ideas! Lol