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8. Tom Hanks

Before he was unofficially christened America's Most Beloved Movie Star, Tom Hanks could be a real smart-ass, which is abundantly clear from his appearances on Late Night. When he was on to promote Splash, he declared he didn't want to show the clip he brought because he was sick of seeing them. Right before Dave jumped to CBS, Hanks ribbed him about taking over the hallowed Ed Sullivan Theater. ("Why you'd want to move to 8 o’clock on Sundays is beyond me … [You're gonna] stand in front of a curtain and say, 'Now, have you seen plate-spinning like this?'") But as his stature rose, Hanks never lost his silly side when he'd come on Late Show, even in 2013 when he announced during the broadcast that he had Type 2 diabetes.