Shane (1953). One of the classic Westerns and one of the classic scenes. Starring Alan Ladd, Van Heflin, Jean Arthur, Brandon de Wilde, Jack Palance, and a dog.
The film was shot outside Jackson Hole, Wyoming, with the Teton Mountains as the backdrop. I spent five weeks at Teton Valley Ranch Camp in 1966, and they still talked about shooting the movie on the ranch property nearby.