David Letterman subtly showed his support for Stephen Colbert after CBS canceled The Late Show. Letterman, 78, posted a compilation video of his tenure as host of The Late Show from 1993 to 2015, via YouTube on Monday, July 21. The clip's caption made a dig at CBS. "You can't spell CBS without BS," the caption read. ("BS" is a shorthand for bulls***.) Many fans of the late night program took to comments section to applaud Letterman's stance.