The latest film to 'spook' me out.

I've now seen over 4,000 films (counting only those seen in a cinema) and every once in a while one comes along that lingers in the mind for having been especially disturbing. It's now a fortnight since I saw 'Paranormal Activities' and it's been, well, 'haunting' me every time I retire to bed. Everyone has their own particular trigger point of fear and though I declare myself as agnostic-going-on-atheist and therefore really doubt an after-life, I still feel there's something going on here which we can't yet explain. Of course I know this film is complete fiction but it does bring to the surface an issue defying rationality. While not for a moment suggesting that seances are conclusive proof of an after-life - surely most of them are trickery of some sort - I do feel there's at least something niggling enough about some cases of seeing 'ghosts', experiencing poltergeists etc. to give pause for thought, though I've never had such an ancounter myself. I wish I could dismiss all these reports as fantasy but I think there's something more to it than that.
The points of this film which really got me (I'll not spoil it for anyone who hasn't seen it) were not so much the more conspicuous haunting events, but when the couple were asleep in bed and suddenly the hall light is switched on. That really made the hairs on the back of my neck stand up. And it's that in particular which I think about when I'm alone in my bed, head under duvet, trying to get off to sleep.
Another film which had a similar effect when I first saw it was 'Blair Witch' - and especially when the trio thought that they'd been walking for several miles only to discover that they'd arrived back at the very point they were at ages before. It felt like my blood was chilling at that point. Whoooo! Spooky!