"Class, next week we'll learn how to nitrate corn starch to make real explosives, not that wimpy stuff they do with fertilizer. Everyone be sure to bring 2 pounds of corn starch with them on Tuesday."
A little acid, a little ethanol, bottled water and a coffee filter, and you've got the good stuff for hand granades, artillery rounds, and other party favors.
At least I know how you got your name...