the physics class last year was making rockets and they kept setting off the fire alarm. eventually we all got used to it and didn't give a forget. the last time they set it off, the office had to announce to school that it was not a drill. when we got outside, there was a huge column of smoke pouring out of the venthood exhaust in the 9th grade building.
turns out someone's rocket fuel had ignited and he threw it all in the venthood, shut the door, and since they never fixed the venthood, smoke got out of it.
the year before that the 9th grade science class made smoke bombs using pie tins and those little hot plates or whatever. someone didn't pay attention and the tin burned through, which ignited all of the compound. since everyone was distracted by the huge column of smoke, their pie tins burned through and went up in flames as their compounds ignited.
