Yesterday, I read about Seikichi Uehara. Holy crap this guy is good. At age 96, he battled  a world boxing association flyweight champion boxer Katsuo Tokashiki (both from Okinawa). Uehara managed to take down Tokashiki, a 39 yr old man , in one hit - not injuring him but landing him completely on his back... supposedly it was televised on New Year's Day 2000 but I could not find a link.Tokashiki never got a hit on Uehara.

Interview (kinda dull but you really can see how tiny this guy is):
http://en.fooooo.com/watch.php?id=24b45780e39dcd7e7140eb078ff7d040

Here's some links of the guy in action:
This first one looks really hokey, since the students fall before they get hit.  But apparently it's obvious to people who understand the art, that the old guy had them beat each time.
http://www.youtube.com/watch?v=mv_oR5Ifm_o

Here's a better one, showing training.
http://www.youtube.com/watch?v=YB0yfAdGnGU&feature=related

And this is the old guy showing how he can use just one hand to incapacitate someone attacking him with a sword.  Looks like he can cut your own head off with your own sword!
http://www.youtube.com/watch?v=mv_oR5Ifm_o&feature=related

I don't know... it kinda looks hocky.  I think if I could see him destroy that boxer that would be good.