Cultural historian John Beckman says America's tradition of fun-loving isn't frivolous, it's fundamental to our democracy. Home-grown American fun, John contends, is one way we express our humanity, push back against elites and would-be autocrats, and make a more perfect union. John traces the history of rebellious fun in America from the Massachusetts colony of Merry Mount in the 1620s to the Merry Pranksters of the 1960s, and from the Sons of Liberty to flappers and jazzmen, b-boys and punks in his new book “American Fun: Four Centuries of Joyous Revolt.”