In The Wizard of Oz, the first question the Wizard asks Dorothy is “Who are you?” In Elia Kazan’s A Face in the Crowd, the first question a duplicitous huckster asks his soon-to-be mark, played by Patricia Neal, is “Who are you?” In Steven Spielberg’s A.I. Artificial Intelligence, the question turns: a tearful mother asks her newly imprinted robot son to tell her, “Who am I?” From Lawrence of Arabia to Amy Schumer’s I Feel Pretty, chances are, if a film has a character who is not what they say they are — if they’re not real — the most existential question of all will be asked.