Talk show host Jimmy Fallon attends the TIME 100 Gala celebrating the "100 Most Influential People in the World" at Jazz at Lincoln Center on Tuesday April 23, 2013 in New York. (Photo by Evan Agostini/Invision/AP)NEW YORK (AP) — The longtime feud between late-night time hosts Jay Leno and David Letterman is the stuff of legend and, it sounds as if, so yesterday.