A Carnival Of SnackeryA New York Times Book Review Editors Choice: Theres no right way to keep a diary, but if theres an entertaining way, David Sedaris seems to have mastered it. If its navel gazing youre after, youve come to the wrong place; ditto treacly self examination. Rather, his observations turn outward: a fight between two men on a bus, a fight between two men on the street, pedestrians being whacked over the head or gathering to watch as a man considers leaping