Just call upon me, your PS2Fantasy Mercenary to teach them punks a lesson...won't cost ya either lol
Anyway you need to release the rage that you have pent up...I know your quiet and don't wanna cause a scene but stand up and do somethin. Next time they do it just yell out in the middle of class "STOP IT!" it will interrupt your teacher's lesson and he/she will have to acknowledge you, and when he does, bingo they're caught in the act!