Twenty or so years ago, I laughed my way down the Natchez Trace, beginning just north of Tupelo and ending somewhere north of Jackson. During that leg of my solo 1,000-mile drive from Grosse Pointe, Michigan, to the Gulf Coast, I laughed for one solid hour. Out loud. Which is the best way to laugh. This festival of fun took place on a sunny Sunday afternoon in springtime; a now-discontinued radio program, Garrison Keillor’s “A Prairie Home Companion,” provided the industrial strength laughs.