LONDON, ENGLAND - MARCH 03: Headgear worn by Muhammad Ali in 1980 inscribed to Syvester Stallone - at the preview of the 'I Am The Greatest' Muhammad Ali exhibition on March 3, 2016 in London, England. The exhibition showcases the life and career of heavyweight boxer Muhammad Ali and features over more than 100 artefacts including personal memorabilia, unseen footage and photographs. It is open to the public from Friday March 4, 2016 at the O2 in London. (Photo by Chris Ratcliffe/Getty Images)
