Bobby Pin Snapper
When I was a kid, we used to twist bobby pins around in such a way that if you pressed it up against someone's skin it would release and produce a quite painful but totally harmless sensation. Then you could just "cock" it and it would be ready to go again and again. I have destroyed many bobby pins recently trying to reproduce that devilish little toy but have not been able to do it. Does anyone out there know how this was done? I think it would make a marvelous instructable.