From GameBrew - a wiki dedicated to Video Game Homebrew.
Blockhead Catapultor is a DS homebrew minigame where you play pranks on others pupils without being noticed by the teacher.
It was an entry for the Dev-Fr.org Coding Competition 2008. The theme of the competition is school.
Use a slingshot to shoot other classmates without teacher noticing.
Stylus - Throw
A - Confirm (menu)
B - Leave (menu)