Another one that haunted me forever was the original “The Thing” in about 51/52. Got my attention!
Another movie that spooked me, and is still one of my favorites is "The Haunting" (1963), with Julie Harris. One of my favorite scenes from the first part of the movie:
"Mrs. Dudley: [Eleanor has just been shown her room after she arrives] I can't keep the rooms the way I'd like, but there's no one else they could get that would help me.
Eleanor Lance: How very nice.
Mrs. Dudley: I set dinner on the dining room sideboard at 6. I clear up in the morning. I have breakfast for you at 9. I don't wait on people. I don't stay after I set out the dinner, not after it begins to get dark. I leave before the dark.
Eleanor Lance: Your husband?
Mrs. Dudley: We live over in town, miles away.
Eleanor Lance: Yes.
Mrs. Dudley: So there won't be anyone around if you need help.
Eleanor Lance: I understand.
Mrs. Dudley: We couldn't hear you. In the night.
Eleanor Lance: Do you have any idea when Dr. Markway...
Mrs. Dudley: [cuts her off] No one could. No one lives any nearer than town. No one will come any nearer than that.
Eleanor Lance: I know.
Mrs. Dudley: In the night. In the dark.
Yeah, James Arness played "The Thing."