Some of the best scary movies are like Friday The 13th, Scream, Night of The Living Dead, Saw or Alien. They are known to be developed in a thrilling script that intrigues the nerves of a person in a great way.
Night of the Living Dead (original black and white and watch it in the dark). Cape Fear (both versions are good). Alien. Aliens. The Exorcist. The Fly (with Jeff Goldblum, not the original). Deliverance (adults only). Whatever Happened to Baby Jane? The Haunting (of Hill House). Coma. Looking For Mr. Goodbar. Halloween. Invasion of the Body Snatchers (original). Scream.
You want scary try Hatchet ( I don't know if it was good because what I saw at the begaining was scary enough, and I'm a fan of scary movies) if you try this movie try wathing it at night and by your self. let me know what you think?