You'll like this. It's an excerpt from an Art Carney special that aired on December 4, 1959. It was written by Sheldon Keller and Larry Gelbart and directed by Burt Shevelove. Not long after, the last two of those men would co-author the play, A Funny Thing Happened on the Way to the Forum.
The mystery guest in this spoof of What's My Line? is, of course, Dick Van Dyke. Playing Arlene Francis is Betty Garrett. Playing Bennett Cerf is David Doyle. Playing Dorothy Kilgallen is Gloria Vanderbilt, who was then a prominent actress and socialite, and who is now best known because her names are on a lot of pants. The other actor who doesn't get to say anything is William Pierson, who was in Stalag 17 and many other films, and who years later would have a recurring role on Three's Company. It's a nice little sketch they're in…