Darker Than Amber is a great, nearly unheard of, action flick directed by Robert Clouse (Enter the Dragon). It's most noted for the shocking film-ending fight scene between Rod Taylor and (the great) William Smith.
From williamsmith.org
Here it is in all its uncut glory. You'll never see another fight scene like this again.
http://www.youtube.com/watch?v=aABT-FjR4_M
The two actors accidentally struck each other with the cameras rolling, one or both of them became enraged, and both ended up fighting each other. This resulted in the accidental filming of a fight, with real wounds, real lost teeth, and real blood all over their clothing.
From williamsmith.org
I hit that wall so hard, man. That was such a tough fight scene. We didn't use any stunt doubles at all. He broke three of my ribs and I busted his nose. ...After he busted three of my ribs, I hit him with a bottle, a real one. ...He busted three of my goddamn ribs and I couldn't even breath and he was still hitting me.
When he whacked me with that board, he missed the knee pad and hit me right there [indicating a spot just below the knee]. To this day when I talk to him, I accuse him of doing it on purpose. Luckily that was the last take of the whole movie.
Here it is in all its uncut glory. You'll never see another fight scene like this again.
http://www.youtube.com/watch?v=aABT-FjR4_M