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LOUISVILLE, KY - JUNE 10: Billy Crystal speaks during a memorial service for boxing legend Muhammad Ali on June 10, 2016 at the KFC Yum! Center in Louisville, Kentucky. Ali died June 3 of complications from Parkinson's disease. (Photo by Aaron P. Bernstein/Getty Images)

LOUISVILLE, KY - JUNE 10: Billy Crystal speaks during a memorial service for boxing legend Muhammad Ali on June 10, 2016 at the KFC Yum! Center in Louisville, Kentucky. Ali died June 3 of complications from Parkinson's disease. (Photo by Aaron P. Bernstein/Getty Images)