Psycho
Like The Exorcist (1973), I can't imagine how scary, surprising, and uninterpretable this was at the time it was released. So primitive and influential that remains scary to this day. A movie that makes the viewer frightened and understanding as a man literally gives a psychological breakdown, justifying Norman Bates' motives. Iconic scenes, Iconic characters, an Iconic ending, with an Iconic style. This movie is...iconic.