David Letterman has not so subtly addressed Stephen Colbert's firing as host of Late Show with a pair of videos on YouTube: "You Can't Spell CBS Without BS."

In 1993, he started working as a writer-producer on Late Night with David Letterman, which aired on NBC. Burnett ultimately made the move to CBS with Letterman when The Late Show was picked up at that network.

CBS’ decision to cut ties with Stephen Colbert and its decades-old “Late Show” franchise come next May will leave a major hole in the format — but one that has been widening. TV networks have been cutting costs at their late-night mainstays for the past few years.

Ten years on, CBS has snatched the crown off its head. The network appears to have grown so dismayed with the state of late-night television that it has unceremoniously canceled one of the genre’s most successful stalwarts: In a statement last night,