LMFAO, my dad is an Ag teacher in Arkansas, and I think I know that guy :P
The crazy stuff that goes on in classrooms here :) I was in high school physics, and my teacher was in the mood to do a demonstration I guess, as it had nothign to do with the course. He had a block of sodium about the size of a deck of card, and he would slice a small sliver off with his nice and drop it into a bucket of water, letting it skim over the top as it oxidized. Anyhow, he had trouble cutting off a sliver, and dropped the whole block in the 5-gallon bucket of water. At this point, I should point out that he was ex-Navy, submariner. He yelled "HIT THE DECK!!" and everyone dropped to the ground. The sodium exploded, and I kid you not EVERY ceiling tile in the lab was destroyed. The bucket was sitting next to a wooden lab station, and the concussion was hard enough to knock the top of it about 4" from where it was, and splintered the supports on bottom. As far as we know, every one was fine, but it was LOUD. The science building was seperate from the others, maybe 20' away, and the only teacher to say anything was the one next door - she just poked her head in and said "Everything alright?".