Something explosive?

Do you know of a chemical I can put on metal "stage" weapons that will make a crack, pop, spark, or bang upon impact? I'm afraid to google anything about it because I'll probably use a bunch of keywords that are wrong and then get arrested.

I'm doing costumes and props for some weird improv thing for a theater troupe, and it's crunch time.

>>8

Then use a goddamned induction coil.  Just anything to step up the voltage and to reduce the current (to keep the whole death thing from happening).