18:light up a dummy and replace the fire extinguisher with a gasoline one.then teachers will use it and cause an explosion.then go up the floor and throw papers and flammable stuffs
19. Bring a lighter to school, then after class, wait until everybody is gone, go to the Teacher's Table and light on the lighter, burn everything that is flammable then go out side run, run like the wind! And then if you have any trees or plants in your school, burn that one also!
[Do not leave any evidence or you'll be...BUSTED.]
22. Bring a lighter [Again] and secretly go to the Teacher's Lounge and burn all the flammable stuff! Heh, at least you don't to worry any low grades or whatsoever!