Build a movie plot around this: What happens when Stanley recovers the mask? experiences dream-like visions which become increasingly disturbing and violent
The answer to this question is:
The story concerns a psychiatrist, Dr. Allen Barnes (Stevens), who obtains a mysterious ancient tribal mask. Whenever he puts on the mask, Barnes experiences dream-like visions which become increasingly disturbing and violent. The visions begin to alter Barnes' personality, and eventually drive him insane.