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Michael J. Fox and Muhammad Ali during A Funny Thing Happened on the Way to Cure Parkinson's A Benefit Evening for The Michael J. Fox Foundation for Parkinsons Research at Waldorf Astoria in New York City, New York, United States. (Photo by Lawrence Lucier/FilmMagic)

Michael J. Fox and Muhammad Ali during A Funny Thing Happened on the Way to Cure Parkinson's  A Benefit Evening for The Michael J. Fox Foundation for Parkinsons Research at Waldorf Astoria in New York City, New York, United States. (Photo by Lawrence Lucier/FilmMagic)