Leonardo DiCaprio scored with 'The Dark Knight' director Christopher Nolan's complicated-yet-entertaining "Mission: Impossible" of the mind, in which a team must enter a target's dreams and plant a life-changing idea. Incredible "how'd they do that effects," a haunting Hans Zimmer score and intriguing themes of dreams vs. reality and love lost provided for a potent alchemy at the box office this summer, with audience members questioning their own reality as they emerged from the theater.