Here's a clip from last night's Late Show, in which Letterman asks guest Dana Carvey to bring out his spot-on Johnny Carson impersonation. Click through for more clips from the interview ...

Comedian Dana Carvey and Ellie Kemper of “The Office” fame stop by the “Late Show With David Letterman” (CBS at 11:35), with music from Sam Smith.

I never quite engaged that,” Carvey, 64, tells PEOPLE in this week’s issue. “I have a lot of drive to try to be the best I can be, have people be blown away by what I do and repeating it.

Like David Letterman, who had to leave Larry (Bud) Melman behind, Dana Carvey has been blocked from taking some comic characters he created while at NBC. Mr. Carvey, a "Saturday Night Live ...

Why Dana Carvey Says He Left Hollywood in the Late '90s — And What He's Doing Now "I have friends who get stressed about fading or not being as hot," the comedian tells PEOPLE.