Mount Airy, North Carolina is known to most tourists as the birthplace of Andy Griffith and the inspiration for Mayberry, where his titular sitcom was set -- and indeed, if you walk down its main street, as I did last week, you'll find nothing but Andy Griffith memorabilia: tee-shirts in every window, restaurants named for its characters, Barney Fife's face peering at you from life-sized cutouts. They even pipe the Andy Griffith Show theme song into the air on a semi-continuous loop (I still haven't been... READ ON