Civil Rights Roundtable with James Baldwin, Harry Belafonte, Marlon Brando, Charlton Heston and Sidney Poitier (1963)

The JFK Pre-Inaugural Gala with guests Milton Berle, Bill Dana, Harry Belafonte, Nat King Cole, Jimmy Durante, Ella Fitzgerald, Gene Kelly and Frank Sinatra (1961)

The Merv Griffin Show with guests Martin Luther King and Harry Belafonte (1967)

The Merv Griffin Show with guest Pat Paulsen etc.

I don't know where some of these YouTubers dig this stuff up. This is, apparently, a sketch that the hilarious Pat Paulsen of The Smothers Brothers Comedy Hour fame taped for The Merv Griffin Show in 1974 that, for reasons that I'm sure are obvious, never aired. So I am told.

Pat Paulsen on Late Night with David Letterman in 1982:

The men that made Paulsen famous: