12) Robert De Niro in The Untouchables

Robert De Niro did a lot of handwork for his role as Al Capone in the movie The Untouchables. He not only embraced the vanity of the character but also his Chicago accent. He worked tirelessly on perfecting his accent. De Niro gained about 30 pounds and insisted on staying in character between breaks.
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Edited by Mudeet Arora