This was too good not to pass on. I know a lot of ladies here are into martial arts, but for those who are not:
http://jezebel.com/how-to-kick-a-guy-in ... 1657810297
I hadn't realized how completely incapacitating blunt impact to the testes can be, or the potential for soft-tissue damage from a hard kick. Probably because I've never experienced it, being a skinny dweeb with no interest in sports etc.
Oh, the comment thread has some interesting feedback too.