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'Paper Moon' (1973)
Family ties: Ryan O'Neal and his real life daughter Tatum in her first screen role
Why it worked: Tatum O'Neal was only ten when she took home the Oscar for Best Supporting Actress (she's still the youngest winner in history) for her role in Peter Bogdanovich's Depression era dramedy, and it's not hyperbole to call her performance one of the most startling debuts in movie history. While the film's gorgeous black-and-white cinematography and Bogdonavich's deft tone-juggling deserve much credit for the film's success, the O'Neals (playing a grifter and a straight-talking young girl who may or may not be his daughter) are the true standouts, bringing a crackling, naturalistic energy to the film that elevates it to a whole other level. While "Paper Moon" certainly could have worked just as well had the two not been related in real life, there's an intangible, lived-in intimacy to their on-screen interactions that perhaps would not have been possible without that pre-existing relationship.