This man should not be alive, according to any Kung Fu movie I've ever watched.  Turning his head so it looks like it's on backwards is not normal, and should not be watched by the squeamish.  Watch the video below, and then go to the chiropractor.

K Dubb has me addicted to reading the comments of every You Tube video that I watch now.  In all honesty, they are usually the funniest part of the video.  Here are the top two from this video.