Norman Bates wouldn't hurt a fly. But he'll destroy your soul just by looking at you. Then the image of a skull is subliminally imposed on to his face, just to get under your skin even further.
A great sequence...except it's not the the last shot of the movie. The last shot is Marion's car being dragged from the lake.
Except there's a fade from Norman's face to the car, so it sort of is
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