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IMDB compiled a list of the top 25 most frightening horror movies of all time. They used data from the box office to determine the highest grossing horror movies around the world, and then took in to consideration how many times reviews of those movies mentioned the words "scary" or "terrifying."
These are the Top 5:
5 - It
4 - The Conjuring
3 - The Exorcist
2 - The Ring
1 - The Blair Witch Project