One of the perks of being Beatles that that group had to get used to in the early days was getting to rub shoulders with the rich and famous. One of the first celebrities they met on that initial trip to America was boxer Cassius Clay.

At the time, the 22-year old Clay was prepping for his first fight against then-heavweight champion Sonny Liston, which was scheduled for Feb. 25 at the Convention Center in Miami Beach. The meeting took place on Feb. 18, 1964 at the 5th Street Gym on Miami Beach, which was owned by Clay's trainer, Angelo Dundee.

Two days earlier, the Beatles proved to America that they were no fluke with their second appearance on 'The Ed Sullivan Show,' which was filmed at the nearby Deauville Hotel. Before going back to England on Feb. 22, they spent a few more days in the Florida sun, where they were treated like royalty.

"There were two great things in Florida," Ringo Starr said in 'Anthology. "One: I was taken to my first drive-in in a Lincoln Continental by two very nice young ladies. Two: a family lent us their boat and let me drive. It was a sixty-foot speedboat, which I proceeded to bring into port head-on, not really knowing much about speedboats...They have those pretty rails on the front, and I bent the bugger all over the place. But they didn't seem to mind, you know; they were just happy!"

"Obviously we were having an effect, because all these people were clamouring to meet us," George Harrison said. "Like Muhammad Ali, for instance. We were taken to meet him on that first trip. It was a big publicity thing. It was all part of being a Beatle, really; just getting lugged around and thrust into rooms full of press men taking pictures and asking questions. Muhammad Ali was quite cute..."

Yes, it was all a staged photo-op and the pictures that emerged -- of Clay knocking out all four men with one punch and him beating his chest as they lay on the ground -- are undoubtedly very silly. But there's something incredible about seeing these five men at a time when they really had no idea of how they would would help shape the world.

Clay won the fight -- and the title -- by technical knockout when Liston failed to answer the bell for the seventh round. Shortly afterwards, Clay announced his conversion to Islam and that, going forward, he was to be called by his new name, Muhammed Ali.

"I taught him everything he knew," Ringo deadpanned.

Watch the Beatles Meet Cassius Clay