Suddenly I want to intrude a good film that I saw last weekend. The name is Witness for the Prosecution, although it is a black and white film released in 1958. You don't know the end until you see the last sentence of the movie. On the other hand, the film has spread positive energy that no one can violate the Law.
This is the only film (I saw) that asks moviegoers not tell anyone about the film results. It's a good marketing approach.