General Motors Corp.'s Cadillac advertises its year-end sales event on regional TV in this ad from Publicis Groupe's D'Arcy Masius Benton & Bowles, Troy, Mich. Regional dealer ad groups are also using the spot, which shows a snowman enamored of the passing Cadillacs. Creative directors: Gary Topolewski, Tim Kostka. Copywriter: Russ Rinke. Art director: Paul Weideman.