Anybody who knows the mere basics of the history of American late night chat shows knows that they need time to settle. Famously, Conan O'Brien was placed on numerous short term contracts with NBC because they didn't think Late Night would pick up on the ratings, and at the time, Conan had barely any experience as a performer. Eventually, he got more comfortable and confident in the role. Now he's one of the most respected chat show hosts in America.
The reason Conan eventually found confidence being a newcomer in the 00:30 slot hosting Late Night on NBC was thanks to the man he took over the show from, that being David Letterman. In the first few months of Late Night With Conan O'Brien the show was not doing well in the ratings, TV critics hated him, he was (in Conan's own words) "a national punchline" and was getting close to the show being cancelled by NBC, until Dave offered to revisit his old show and be a guest, which helped turn things around dramatically
On Letterman's final night hosting the Late Show on CBS in May 2015, Conan used his opening monologue on his own TBS show to say thanks to Dave for saving his career in Late Night, and even told his viewers to switch over at 23:35.
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