Quote Originally Posted by Heavy D
For starters, you're taking it a bit too literally, of course certain people couldn't knock out Ali. But any punch at the right time under a certain set of circumstances can knock someone out. It happens all the time, especially in MMA.

E.G.  Goulet getting dropped like 3 seconds into a fight by a short jab. It just happened to catch him right and the body didn't like it and shut down. Also watch the Vernon White vs Chuck fight...those two guys traded haymakers the whole fight. And what knocked White out? A jab thrown by Chuck WHILE backpeddling. Not exactly the most forceful punch he had thrown. But it just so happened to land in a way that White dropped.

Or hell...even Harry Houdini. The guy was famed for being able to take a punch to the gut by ANYBODY. And what killed him? A college boxer popped him one in the gut when he wasn't ready and it lead to his death. Anybody can get caught the wrong way by a punch at any given time, as small as the likelyhood may be.
i did take that a bit to literally because everyone has a knockout reflex. I've seen a couple of different explanations on how knockouts actually happen. The first one i saw was that the quick snapping of the neck causes a breif lack of blood to the brain which causes a "mini stroke" resulting in unconsciousness. Another one was that said snapping motion of the neck interfers with electric signals traveling thru the brain stem theres a momentary stoppage of the signals and it results in unconsciousness. Then there was that national geographic thing that said its the brain slamming off the skull. Now are all these plausible explanations or is one correct and the others just coincidentally happen at the same time?