American heavyweight boxer Cassius Clay (later Muhammad Ali) in a boxing ring with the Beatles at the 5th Street Gym, Miami, during the run-up to his title fight against Sonny Liston, 22nd February 1964. The Beatles are holding up cards describing Clay as: 'Greatest', '218 lbs', 6', 3''' and '22 yrs'. Left to right: Paul McCartney, George Harrison (1943 - 2001), Clay, Ringo Starr and John Lennon (1940 - 1980). (Photo by Chris Smith/Popperfoto via Getty Images/Getty Images)
