Mystery novelist Agatha Christie once suggested that the best way to tell a story that will leave an audience guessing to the end is to conceal the “critical move” with a “big move.” A mysterious movie that stumped me till the end is The Sixth Sense. The big move was a therapist who started to see a young boy who claimed to see dead people. The critical move that took countless viewers by surprise [spoiler alert] was that the therapist later learned that the reason the young boy “saw” him was because he himself was actually dead.