This sounds like a crazy weapon, but my brother bought me a blow dart gun from a gun show when I was a teenager. I think he thought it was funny when he tried to get me to try it. But once he set up a target and kept moving it back further and further, he was shocked it's potential. One night, someone tried to climb through my window, and I had it on my nightstand. I got that guy right in the neck and he drew blood and ran away. The cops were able to catch him, partly because of the scrapes on his neck. One strike for the good guys!