When Dana Carvey appeared on 'Late Show' (weeknights, 11:35PM ET on CBS), he teased David Letterman about being on vacation whenever he visits New York. "The guy out West -- he doesn't go on vacation." In mock Leno, he teased, "Why would you go on vacation, when you can tell jokes? ... Go to a beach and sweat? You could be telling a joke, doing a monologue!"

Carvey then mentioned another legendary late-night battle: Johnny Carson vs. Merv Griffin. "Carson hated Merv," Carvey said. In pitch-perfect Carson, he said, "I can't even stand looking at the [beep]." Letterman guffawed, and after the two exchanged stories on bypass surgery and their aging bodies, the host asked him to impersonate Carson again.