"Duel" by Yojimbo
Like The Birds before it, this film is more about the director's skill at cultivating a sense of menace and tension rather than any form of plot development. In that spirit, a travelling salesman inadvertantly pisses off the driver of a huge semi truck, who then pursues him in a gripping game of cat and mouse down the highway. It may not sound like much, but Spielberg's abilities as a storyteller are obvious even at this early stage in his career. Weaver also deserves a nod as he has to carry the movie pretty much by himself being the only human combatant to be seen!