Book excerpt: This groundbreaking film study begins with a survey of American print humorists from eras leading up to and overlapping the advent of film--including some who worked both on the page and on the screen, like Robert Benchley, Will Rogers, Groucho Marx and W. C. Fields. Six comic film genres are identified as outgrowths of a national tradition of Cracker Barrel philosophers, personality comedy, parody, screwball comedy, romantic comedy and dark comedy. Whether it is Mark Twain or a parody film involving Steve Martin, comedy is most often about blowing "raspberries" at the world, and a reminder you are not alone.