all my school gets frequently is the fire alarm going off bc the seniors in the physics class can't keep their forgetin rocket fuel in check. they set it off like 6 times so far and at this point no one really flinches when the alarms scream at us. we just wait to see what the office says.
someone like that happening in freshman year science for me
the teacher just went up to the front table, moved some stuff off, then poured alcohol on it and set it on fire (it burned itself out after a few minutes)
the lesson was about acceleration so I don't know why the hell he did it