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My old chemistry teacher was a bit of a character.
He always had home made fireworks in his pockets and more than once we had to evacuate the classroom after he'd not bothered using the fume cupboard to make poisonous gas.
One lesson he decided to demonstrate how powder could explode and blew a few ceiling tiles off making flour explode and then did the same with, for whatever reason, powdered dried mushrooms.
aggi-
My old chemistry teacher kept mars bars in his pockets, with which he would try and persuade young boys to do things like help him calibrate his rectal thermometer. But he also liked to throw lumps of sodium into buckets of water every so often and make volcanoes out of piles of aluminium shavings, so he too was a bit of a character.
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My chemistry teacher showed us how to make (although I'm not convinced it was) mustard gas.
itsbruce
ELbowloh
I remember being astonished when I learned that the failed London bombers of July 21st 2005 used chapati flour as a key ingredient in their bombs. Who knew that flour could be so dangerous? I certainly didn't.