by DICK CAVETT and
CHRISTOPHER PORTERFIELD 373 pages. Harcourt Brace Jovanovich.
Dick Cavett is the darling of people who say proudly that they never watch television. His wit is quick and responsiveit avoids the soggy, set-piece gag and flashes in reaction to what the guest has just said. When Norman Mailer once proclaimed that he was smarter than the other guests, Cavett briskly offered him another chair to contain his giant intellect. While the Jack Paars or the Merv Griffins or the Johnny Carsons put on guests like Zsa Zsa Gabor and Buddy...