All About Eve (1950) , Joseph L. Mankiewicz

Based on the story The Wisdom of Eve by Mary Orr, All About Eve is an elegantly bitchy backstage story revolving around aspiring actress Eve Harrington (Anne Baxter). Tattered and forlorn, Eve shows up in the dressing room of Broadway mega-star Margo Channing (Bette Davis), weaving a melancholy life story to Margo and her friends. Taking pity on the girl, Margo takes Eve as her personal assistant. Before long, it becomes apparent that naïve Eve is a Machiavellian conniver who cold-bloodedly uses Margo, her director Bill Sampson (Gary Merill), Lloyd's wife Karen (Celeste Holm), and waspish critic Addison De Witt (George Sanders) to rise to the top of the theatrical heap. Also appearing in All About Eve is Marilyn Monroe, introduced by Addison De Witt as "a graduate of the Copacabana school of dramatic art." This is but one of the hundreds of unforgettable lines penned by writer/director Joseph L. Mankiewicz, the most famous of which is Margo Channing's lip-sneering admonition, "Fasten your seat belts. It's going to be a bumpy night." All About Eve received 6 Academy Awards, including Best Picture.