Heh... My favorite science teacher back in high school blew out the fume hood with a zinc dust/sulfur reload of an Estes model rocket engine. One of his demos had two police officers bursting into the room. (That one was actually completely harmless; he was demoing electrolysis of water, bubbling the stoichiometric results through soapy water, and lighting the bubbles to the delight of all. Made a crack like a
The last straw, I think, was the accidentally dropped bottle of butyric acid. Harmless enough, but... the smell... He didn't come back the next year, alas. He was enrolled in a PhD program last I heard.