From the New York Times obituary of Joey Bishop:
He refused to memorize jokes. "The kick is to think quickly," he told The Los Angeles Times in 1966. "It's a great kick." ... He got laughs one night when, in middle of a performance at the Copacabana in Manhattan, Marilyn Monroe suddenly appeared, swathed in white ermine. Bishop was quick. "Marilyn, I told you to sit in the truck," he said.