Crystal Meth is Methamphetamine, or Nazi Crank
Developed by the runners-up in WWII to give their soldiers a bit of extra pep, it backfired to the point where (on one occasion) the squadron holding a building against the Russians got totally freaked out and paranoid, firing into the blackness of night. In the morning the Russians walked up to the building and took it because they'd totally run out of ammo. Allied forces had regular amphetamine, which although it can fuck you up, is nowhere near as strong. Crystal Meth is usually smoked or injected.

Crystal MDMA is completely unrelated except that it's a crystal. It's the active ingredient in pills, so essentially it's like taking a pill but without any of the rest of the crap that they mix into them. A couple of grains dissolved in a drink will do the trick.

For further reading:
en.wikipedia.org/wiki/Methamphetamine
en.wikipedia.org/wiki/MDMA
( emvee cruor deo cruoris, Thu 23 Sep 2010, 9:26, Reply)