20 Classic 'Late Show' Moments We're Glad We Stayed Up Late For

20 Classic 'Late Show' Moments We're Glad We Stayed Up For: Joaquin Phoenix interview in 2010

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Two full decades have passed since David Letterman first brought his wacky late-night antics to CBS with "Late Show With David Letterman." To celebrate "Late Show's" 20th birthday, here are 20 slices of vintage Letterman that were so good, we didn't even mind feeling groggy the next day. — Dave Nemetz, Yahoo! TV

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