The veteran comedian, 78, shared a video montage of him roasting the TV network during his decades-long career of hosting “The Late Show” from 1993 to 2015.{ai:summary}<p>It appears there is no content provided to summarize. Please provide the text or topic you'd like summarized.</p>

David Letterman weighs in on cancellation of Stephen Colbert’s ‘The Late Show’: ‘You can’t spell CBS without BS’

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