Watched that particular special with my college fraternity brothers and laughed our asses off. I'd been familiar with his comedy since the early 70's, listening to my parents' 8-tracks of his comedy albums.
True dat, about the early 70s. I had a couple of his albums - "Occupation Foole" and "Class Clown".
In in a bit of a biography I read about him some time ago, he partnered with Jack Burns and the two of them played the comedy circuit for a couple of years - from ~1960 till 1962. So I'll correct myself on that. He definitely did comedy throughout the 60s and tried acting as well, which scared the hell out of him.