staple gun into a BB gun
I can't access youtube from this PC, but the video is easy to find, just search "homemade shotgun"
I had been planning on making a single-shot pistol from a Stanley staple gun that I have, but I just don't have the necessary tools... yet...
and don't worry, my version was going to be for self-defense and home protection.
also, if someone does make an instructable for a staple-BB-gun, I might use the basics of that for my "StaPistol"