9) Sylvester Stallone in Rocky IV

When Sylvester Stallone acted as a boxer in the movie Rocky IV, he insisted on being as true to the character as possible. To achieve this, he not only went through extensive training and maintained a strict diet, but also asked to film real fight scenes. During one of these scenes, he got severely injured, but still continued the fight scene in order for it to look authentic.
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Edited by Mudeet Arora