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Celebrity Alien Encounters

15 of 19

Muhammad Ali

Legendary boxer Muhammad Ali says he has seen UFOs on several occasions, with the most notable instance occurring during a jog in New York City's Central Park with his manager. —XFINITY Entertainment Staff

(Photo: Trevor Humphries, Hulton Archive/Getty)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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