Ooooh super question...
I would say, in no particular order...

Creep
Dark Water (The Japanese Original)
IT
28 Days Later
30 Days of Night
(Flim-Flam the Magnificent "You is talking loco and I like it!", Wed 10 Jun 2009, 14:25, 2 replies, latest was 16 years ago)

30 Days of Night
really?
(Bazongaloid, Wed 10 Jun 2009, 14:28, Reply)

Yup
I really liked it, I just liked that the vampires were more realistic than in most films. Plus I had a soft spot for the story before the film was made, I guess that helped!?
(Flim-Flam the Magnificent "You is talking loco and I like it!", Wed 10 Jun 2009, 14:34, Reply)

Creep was shit
I had such high expectations for it too :(

Dark water was terrifying though
( fuck shit up the best you never had, Wed 10 Jun 2009, 14:29, Reply)

I thought Creep was pretty horrible
especially the bit when the women in the dentists chair wakes up but can't shout for help and then he mimes all the operation stuff. yukky.
(Bazongaloid, Wed 10 Jun 2009, 14:31, Reply)

That bit is
pretty grim. I dunno I guess its just one of those films I can happily watch again and again. There are a lot of horror films I love but can only watch once or twice a year such as Last House on the Left and the original The Hills Have Eyes, you just can't watch them too much, they're too freaky. Creep I could chill out and watch on a Sunday.
(Flim-Flam the Magnificent "You is talking loco and I like it!", Wed 10 Jun 2009, 14:37, Reply)

But he wasn't an effective bad guy/monster
and she was just flat out annoying. I haven't liked her in anything since Run Lola run and the Bourne films though.
( fuck shit up the best you never had, Wed 10 Jun 2009, 14:37, Reply)

You're right
as bad guys go he was pretty lame. I guess I rate it because it came out at a time when everyone was doing torture porn it was nice to see something slightly different.
(Flim-Flam the Magnificent "You is talking loco and I like it!", Wed 10 Jun 2009, 14:39, Reply)

Torture porn?
Like Hostel? God that was awful
( fuck shit up the best you never had, Wed 10 Jun 2009, 14:42, Reply)

Yup
I used to be a fan of Eli Roth until he did that. You shouldn't go to watch a horror film at the cinema and spend the entire film laughing.

There are so many horror films out there that are torture related and just so crap. That’s all it is, they just try and make you uncomfortable by seeing too much. I personally like a little bit of suspense and mystery, my imagination is far scarier I don’t need to see someone burn an eyeball out of someone’s head. Ho-hum.
(Flim-Flam the Magnificent "You is talking loco and I like it!", Wed 10 Jun 2009, 14:49, Reply)

Before he did that...
You liked Cabin Fever?
( Cawl, Wed 10 Jun 2009, 14:52, Reply)

I did
again, it was something different. I didn't really think it was scary, it was more funny and worrying as if I was stuck in a cabin in the middle of nowhere with some of my dumbass friends, and the events in the film actually occured in real life, they would all die or get eaten by dogs etc.

I saw too much of my friend Alan in one of the characters. :S
(Flim-Flam the Magnificent "You is talking loco and I like it!", Wed 10 Jun 2009, 14:58, Reply)

I really liked the first two Saw films, but they quickly went downhill
Hostel was recommended to me, so I duly watched it and haven't laughed so much for a long time.
( fuck shit up the best you never had, Wed 10 Jun 2009, 14:53, Reply)

See
I really didn't like the Saw films, I have only seen 1, 2 and 3, I don't think you could force me to watch any of the others. They're just terrible.
(Flim-Flam the Magnificent "You is talking loco and I like it!", Wed 10 Jun 2009, 15:02, Reply)

He wasn't too bad
I found it much better after watching the DVD extras which explained who he was and what happened in his earlier life.
( SpikeyPickle wishes he was mabazaritchie, Wed 10 Jun 2009, 14:39, Reply)

For me, if a film has to rely on extras on the dvd to make the film more plausible then it has failed.

( fuck shit up the best you never had, Wed 10 Jun 2009, 14:41, Reply)

A valid point

( SpikeyPickle wishes he was mabazaritchie, Wed 10 Jun 2009, 14:47, Reply)

Yeah
They didn't really touch on it too much in the film, perhaps they were trying to keep it short!?
(Flim-Flam the Magnificent "You is talking loco and I like it!", Wed 10 Jun 2009, 14:42, Reply)

that would be it
It made me feel quite sympathetic for Vincent to be honest. I felt a bit sad for Samara after watching The Ring as well.
( SpikeyPickle wishes he was mabazaritchie, Wed 10 Jun 2009, 14:46, Reply)

Hehe
I felt sorry for Samara too, I got shouted at by a friend for being sympathetic towards the baddie. Hehe
(Flim-Flam the Magnificent "You is talking loco and I like it!", Wed 10 Jun 2009, 14:50, Reply)

But she didn't mean to be the bad guy
it was only because of stuff that happened to her. I felt bad for her too.
( fuck shit up the best you never had, Wed 10 Jun 2009, 14:54, Reply)

That was my point too
They wern't having any of it. :(
(Flim-Flam the Magnificent "You is talking loco and I like it!", Wed 10 Jun 2009, 14:59, Reply)

Same applies to 'The Grudge'

( SpikeyPickle wishes he was mabazaritchie, Wed 10 Jun 2009, 15:08, Reply)

Yup
I agree. There are quite a few films out there where you end up feeling sorry for the baddie.

My big example of this is Robin Hood Prince of Thieves. Every time I watch it I want Alan Rickman to win.
(Flim-Flam the Magnificent "You is talking loco and I like it!", Wed 10 Jun 2009, 15:12, Reply)

Dark Water
is really very good, even the re-make was okay! :)
(Flim-Flam the Magnificent "You is talking loco and I like it!", Wed 10 Jun 2009, 14:37, Reply)

Sean Bean on a farm?
with lots of sheep jumping of cliffs? Was that Dark Water?
( SpikeyPickle wishes he was mabazaritchie, Wed 10 Jun 2009, 15:12, Reply)

Hehe
Not quite! :)

uk.imdb.com/title/tt0382628/

Thats the re-make. It has a link to the original in there too somewhere.
(Flim-Flam the Magnificent "You is talking loco and I like it!", Wed 10 Jun 2009, 15:16, Reply)

Ah!!
I was thinking of this:

uk.imdb.com/title/tt0411267/
( SpikeyPickle wishes he was mabazaritchie, Wed 10 Jun 2009, 15:28, Reply)