Groucho was a prolific writer with “a genuine intellect,” according to Cavett, despite not finishing public school. "Groucho & Cavett" premieres TOMORROW December 27 at 8/7c on PBS. [VID: Interview with Dick Cavett and clips from "The Dick Cavett Show." Transcript: He was a genuine writer, a genuine intellect. He was such a literate man, such a well-read man. His grammar, his language was artful and perfect. If I'd have gone to college, I'd have been a writer much faster in my life and probably