In Black Swan, Natalie Portman plays a prima ballerina with problems. She’s just been entrusted with a role she has no idea how to play. She lives with her mother, a bitter and broken-down control freak who comes on like Piper Laurie in Carrie. She’s scorned by her role model. She sees visions of her doppelgänger in mirrors, in construction walkways, and even in the bathroom. It’s possible that she’s growing wings. She may have an imaginary friend. She may be a virgin. She needs to get laid.