testicular pursuit
You will need : sunlight, watch. The object: to reflect sunlight from your watch onto the testicles of the unsuspecting teacher. If he is wearing clothes, aim at the crotch of his trousers. Divert your beam away from the teacher once he has begun to suspect that the entire class is laughing at his nob. Conceivably, if everyone in the class did the same thing, you could set the teachers testicles on fire. In larger classes, you could sear through the testicles as a laser.
written by excluded pupil, Jo* Blyt*, approved by Phil