John Wayne ‘screamed in fury’ when caught using oxygen mask on set with Dean Martin

John Wayne lived out his tough big-screen persona in real life, according to his The Sons of Katie Elder co-star Dean Martin. Duke continued doing his own stunts right after having a cancerous lung removed, which included almost catching pneumonia after being dragged through a river multiple times. The star even had to rely on an oxygen mask on set, which he was photographed using, making the Hollywood legend explode in rage.