Ive been having a discussion about some of the greatest KO punches in history in another thread so I thought I'd post a thread asking what peoples favourite knockout shots are. Some that were mentioned were:

Tommy Hearns vs Roberto Duran
Lennox Lewis vs Hasim Rahman
Rocky Marciano vs Jersey Joe Walcott
Floyd Patterson vs Ingemar Johannson

Others that spring to mind are:

Roy Jones vs Montell Griffin
Mike Tyson vs Trevor Berbick
George Foreman vs Michael Moorer
Wlad Klitschko vs Calvin Brock