They think something's gone wrong, but in Don't Look Now, for instance, one scene was made by a mistake. It's the scene where Donald Sutherland goes to look for the policeman who's investigating the two women.
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Don't you think it's something strange that you rarely look at yourself in the mirror, except to do things like stand and ponder? I mean, in Shakespeare's day, it was thought that the mirror would reveal something, that it is trying to tell you something - not just to tidy your hair, but something more.