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We made Di-Nitro-Toluene (DNT) in chemistry once, no idea why. It's a precurser to tri-nitro-toluene (TNT). Our teacher announced that we wouldn't be able to get it there (I think you just had to massively boil it, possibly under pressure, to get there).
We gave it a bash anyway - he eventually raised an eyebrow and told us to stop when we had four or five bunsens aimed at a test tube full of the stuff.
christianSpaceman
@DethBeard
Science labs were always fun, we once had to (I'm paraphrasing here) test the resistance of different metal wires.
By hooking them up to a battery.
Thin guage wire melted, thicker stuff got hot, some didn't react much at all.
So we hooked 6 batteries up to see if the increased voltage would help. And then almost burnt the place down by trying to burn ruse words into the wooden desks.
We also used to nick the rubber hoses for Bunsen burners to use in bongs.