Who reputedly prepared his voice for the role of 121-year-old Jack Crabb by screaming at the top of his lungs for an hour?

Little Big Man is a 1970 American western comedy-drama film directed by Arthur Penn and based on the novel Little Big Man by Thomas Berger. It is about a white male child raised by the Cheyenne nation during the 19th century. The film is largely concerned with contrasting the lives of American pioneers and Native Americans throughout the progression of the boy's life. The movie stars Dustin Hoffman as Jack Crabb (aka Little Big Man).

To obtain the hoarse voice of a 121-year-old man, Hoffman sat in his dressing room and screamed at the top of his lungs for an hour. The makeup for the ancient Crabb was created by Dick Smith from foam latex and included revolutionary false eyelids that could blink along with the actor's. Due to editing, and much to Smith's chagrin, no blinks were visible in the finished film. Of the makeup, Hoffman was quoted in Life as saying, "I defy you to put on that makeup and not feel old". The role of Chief Old Lodge Skins was initially offered to Marlon Brando, Paul Scofield, and Laurence Olivier, all of whom turned it down.