A few weeks ago I chaperoned a field trip to a civil war muster
It concluded with a few volleys of the muzzle loaders
I just so happened to see a few of the kids pick up some unopened black powder cartridges that fell during the presentation
I mentioned it to the teacher and she wasn't too worried about it
So I explained to her what black powder is, it was funny to see her face drop as the realization sat in that I just told her some of her kids had packets of gunpowder in thier pockets