[The Hierophant]

Well, since you can't physically punish him I would recommend more subtle methods of vengeance. Slash the tyres in his bike, delete his savegames, shred his homework... that sort've thing. Of course you must deny all knowledge when he confronts you, be smart and don't leave any evidence. He'll know that it's you doing all these things, but therein lies the beauty if he can't prove anything. If he tries to beat you down, just run like hell. If it worked for the Viet Cong it can work for you.