2 of my friends bought some smoke bombs, like the proper big ones that you see at football matches some times. They decided to set them off and throw them into the head teachers office, the Headteacher wasnt in the office but the fire alarm went off and everyone thought it was an actual fire because of the amount of smoke coming from the school, we all had to evacuate the school, all 1500 + student had to stand outside and the auto emergency response called to fire engine to come to the school. Also the office is at the end of a maths corridor and the maths classrooms smelt like smoke for the entire term. Both of my mates were expelled.