One day on the set of Bernardo Bertolucci's Last Tango in Paris, Marlon Brando was instructed to simulate sex with co-star Maria Schneider. Though he had his pants on in the scene which appears in the film, Brando did try to shoot it with full frontal nudity. He soon changed his mind. "It was such a cold day," Brando later explained, "that my penis shrank to the size of a peanut!"

["Remember his whole orange peel ad-lib in The Godfather? Well, in one scene during this film, Eva Marie Saint mistakenly drops her glove, but instead of stopping and shooting a retake, Brando improvises. He picks up her glove and nonchalantly starts putting it on his hand, never missing a beat with his lines. He took another actor's mistake and made it look like it was part of the script."]