An exchange between David Letterman and guest Albert Brooks on Monday night's Late Show has begotten buzz that the late-night vet has an eye on retirement. "I think we are going to be here another two or three years," Letterman said in response to Brooks' quip that the talker's days are numbered. Per the New York Post, some theorize that the banter was planned as a "trial balloon"/negotiation ploy of sorts. Brooks, however, told reporters at a Looking for Comedy in the Muslim World junket on Tuesday that the conversation topic was "not at all" discussed beforehand. A Late Show rep tells the Post, "Dave has no plans to retire."