I absolutely love horror movies, I have a long list
"The Changeling". Oh my...I still get the creeps just thinking about that movie...
"The Haunting". The
original one, not the re-make. Just the idea of what you
don't see...
An old film called "The Uninvited". The first time Hollywood took ghosts seriously. Great one. Some nice chills and a mystery plotline as well.
The one part in "Gaslight" when Ingrid Bergman is trying to tell Charles Boyer about the incriminating letter, and he says "Yes! Yes, I remember it well! You standing there saying the words, and there was no paper in your hand! THERE WAS NOTHING THERE!!!" Just the idea that someone could make a person doubt her sanity like that...now that is chilling *shudder*
"The Shining". Again, the original. A classic.
Actually, "The Others" had some frightening moments as well. When Nicole Kidman is looking through that photo album of dead people...and then when her husband comes home and he's lying in the bed, they make it look like one of those pictures...*shudder* (I also liked that film because it didn't have the typical "release" motif, where the restless spirits go on to the next world. These ghosies are sticking around...)
The first "Halloween" had some great moments. 1.) When the girl gets into the car and notices the fogged-up windows, and you know what's coming... 2.) When Jamie Lee is running/limping across the road, banging on doors and calling for help and no one will help her, and she can't get into the house. Talk about a nightmare. 3.) When Myers is standing in that doorway wearing the sheet, with the glasses on his face, over the sheet. Yeeeh....
Another John Carpenter flick, "The Fog". A little too gory for my taste, and easy to make fun of; but the way those ghosts knock on those doors

And when the captain's voice comes over the tape player...
When I saw "The Exorcist" on video, I just laughed at it. When I saw it on TV all edited, it scared me to death. Go figure...
It's not a movie, but...the "Talky Tina" episode of "The Twilight Zone" (I think the episode title was "Living Doll"). I think that was Hollywood's first foray into the "talking doll" thing. And it's still more terrifying than any other attempts.