I was talking about this documentary recently with Adriana because I have recently seen "Tyson" and I was saying how I forgot how the tail end of Muhammed Ali's career and the very beginning of Mike Tyson's career overlapped a little. I was telling her how Ali came into the ring when Mike fought Trevor Berbick for his first Heavyweight title and asked the young Iron Mike to "Get him for me." Trevor Berbick was the last opponent Ali ever fought, ending his career with a loss to Berbick in 1981.
It made me think of this great(and sad)HBO documentary about the rivalry between Ali and Joe Frazier. If you have not watched it you really should, fight fan or not. Here is Part 1, the rest can be found on YouTube.