What is the scariest horror movie in history?

Approaches Halloween and movie fans terror they use the date as an excuse to go back to see the best films that the genre has produced throughout history.

Many consider that Psychosis (1960), by Alfred Hitchcock, is the best film of the genre for the iconic scenes it has and because it was the kickoff that would later give rise to the popular slashers of the ’80s.

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What is the scariest horror movie in history?