The Mike Douglas Show with guests Andy Kaufman, Robert Goulet and Carol Channing (1977)

This picture depicts a magazine article called Nervous Laughter. A good desciption of this fine selection.

Watch in the clip below and realize that the whole set starts spinning with ridiculous speed and the whole panel keeps a straight face as it happens. The motorized 1970s talk show set - I'm surprised Conan has never got around to doing a take-off gag based on the idea.