VIDEO: Billy Crystal Talks Hanging Out With Muhammad Ali & Robin Williams on THE LATE SHOW WITH STEPHEN COLBERT

Billy Crystal, who has a new mobile app called "Roast 'Em," stopped by "The Late Show With Stephen Colbert" to remember some wild times at Friars Club roasts in the good-old-days. Watch the clip below!

Crystal starred on Broadway in "700 Sundays," which he also wrote. He also wrote and starred in the Off-Broadway play "Have a Nice Day." He's a film and comic icon known for roles in "When Harry Met Sally," "Monsters Inc.," and more.

The Late Show with Stephen Colbert is the premier late night talk show on CBS, airing at 11:35pm EST, streaming online via CBS All Access, and delivered to the International Space Station on a USB drive taped to a weather balloon. Every night, viewers can expect: Comedy, humor, funny moments, witty interviews, celebrities, famous people, movie stars, bits, humorous celebrities doing bits, funny celebs, big group photos of every star from Hollywood, even the reclusive ones, plus also jokes.

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