It was a decision to work clean. I just prefer to work that way. I have no problem with comedians who don't work that way. There was a temptation in the early '70s to reconsider. I decided against it.
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Don Rickles and I are best friends. I know that might seem strange to those who know Don only by reputation, but somebody has to be his friend. Just to make sure I don't forget, Don gave me a doormat that sits just outside the front door of my house. It reads: 'The Newharts: The Rickleses Best Friends.'