We upped the ante on the "arrow in the air" trick... while we didn't fire directly up, we took the tip off an aluminum arrow, filled it with Pyrodex and glued a .22LR blank to the front of the shaft... didn't work as well as we hoped, wanted an effect like the dynamite arrows the Duke boys had... it didn't burn fast enough to blow up like that... but did make fire. We had good success with refilling CO2 cartridges with powder and putting a fuse in them, though.
I remember strike anywhere matches in the BB gun, and BB gun fights... none of that pansy Airsoft stuff was invented yet.