Rocky
The only remaining evidence that Sylvester Stallone might have had a respectable career, this 1976 Oscar winner (for Best Picture, Director, and Editing) is still the quintessential ode to an underdog and one of the best boxing movies ever made. After writing the script about a two-bit boxer who gets a "million-to-one shot" against the world heavyweight champion, Stallone insisted that he star in the title role, and his equally unknown status helped to catapult him (and this rousing film) to overnight success.