I watched an old Muhammad fight documentary (about 2 hours long) which covered to time frame of him in the Olympics to his rematch win over Leon Spinks. Filled with fight footage, interviews and outside the ring coverage.

Prior to this, I had little knowledge of Ali's history (the Liston upset, suspension from boxing, Frazier fight, etc...), so it was as if I was watching his career unfold in real time. I watched the Frazier fight completely clueless about the result and was shocked that Frazier came out of top....decades after the fight actually happened.