Cool story. I graduated in 1980, and our variation on this was blowguns shooting plastic beads from craft stores. The "rich" kids bought pre-made blowguns, and the rest of us fashioned our own out of whatever small tubing we could come up with. Keep it short enough, and you could slip it up a long sleeved shirt, or cut a small slit in the leg of your jeans "carry concealed". You'd be surpised how fast you can unload a pretty good mouthful of those beads in "full auto" mode while someone's guard is down when they step out of their car in the parking lot at school.
