Just finished watching it...
Contains spoilers.
I had seen this movie on "Bravo's 100 Scariest Movie Moments," (I owe that show so much, lol) and I thought that it looked interesting, so I bought a copy.
My mum and I turned off the lights and settled down to watch it and before long, we were both watching it through our fingers.
I should point out that I don't get easily scared when it comes to horror and I love classic horror; I've seen lots of them and only two have truly terrified me: the original "Amityville Horror," and Alfred Hitchcock's "The Birds."
The scene where John Russell is sat at the piano and the door starts to slowly open, my first thought was it was one of the servants, but then I also thought that maybe it wasn't and I was actually leaning sideways trying to see who was behind the door and when it was revealed that no-one was there I leant back in my seat.
Likewise with the scene where the ball that John had previously thrown in the lake came bouncing down the stairs towards him (that was the scene they showed on "Scariest Moments") and the seance scene was just so creepy.
I thought it was very tense, creepy and atmospheric and it is definitely on my Halloween movie list now. :)