[ame]http://www.youtube.com/watch?v=nFMPwBHVauw[/ame] Dempsey, Ketchel and Tyson are up there, but there really was something about Nigel Benn.
Guys like Duran and Dempsey are obvious usual suspects. Ace Hudkins deserves at least an honorable mention. Graziano is somebody else who ought to be recognized. (Is there a single photograph of him in competition which shows a neutral or passive expression?)