VHS at least the first part, the party scene
I also thought ATM was good to

I agree with all what have been recalled earlier.

As for me, I keep affirming that the more disturbing and terrifying movie is Antechrist (by Lars Von Trier logically).

Several scenes are frankly creepy. It's not that violent. It's not that gory. It's just kind of macabre... The result is very weird and you don't feel very good after having seen this one.

Apart from that, the opening scene is splendid...

I don't know what scares you personally, but I will list some films that scare me (or at least creep me out).

Paranormal Activity (especially one and three)
The Devil Inside
The Blair Witch Project
The Haunting (1963)- did not terrify me, but it did sort of creep me out
Signs (creeps me out)
The Changeling (1980, not necessarily scary, but certainly creepy)

YES! Finally someone discusses the third one. I thought it was really scary!

I agree I thought the first was the scariest and the third one was not far behind it. I also liked that it was set in 1988. I thought that that would make it less scary, but it didn't. The scenes I remember most vividly were when the sheet fell down and when they played that Bloody Mary game in the bathroom. I do want to be clear, although the second scariest one, to me, was the third, I still belive that the first was, by far, the scariest. The second one was still scary, but not as much as either one or three. Four had its moments, but it was, by far, the least scary. Not to mention, ridiculous (spoiler ahead) demonic, zombie witches, really? That is one of the worst horror movie endings I have ever seen.

I just couldn't get into it, too tedious waiting around for stuff to happen.

I'm sorry but all those lists are terrible.

Watch

The poughkeepsie tapes
VHS 1 AND 2
The house of the devil
Sinister
Dark skies
The new Maniac

That is your opinion, many will disagree. What scares you varies from what scares other people. I actually did not think that Sinister was as scary as people claimed. It relied too much on cheap scares. It was a pretty good movie that was pretty effective at building suspense, but overall I think it is a little overrated. I would not go as far to say that your list is terrible because that is a little rude. Many of the lists that other people created consist of many really good movies.

What scares each individual is different.. some fear living dead, some fear what cannot be seen, some fear ghosts etc I think age is a factor as well. I used to find Evil Dead terrifying when I was 9 but now not anymore.

I have such a hard time finding a good scary movie that could really scare the crap out of me.. if anyone have any suggestions, please let me know :( I actually miss being scared. I watched Insidious last week and found it scary because I find seeing dead people (not zombie) is a scary thing. Same as The Sixth Sense and The Eye (original).

Paranormal Activities put me to sleep.

If you have fear of clowns, I find Stephen King's IT to be scary. Damn that pennywise.

I find Lambertoo Bava's Demons to be scary.. especially their transformation part.

I should mention I find some classic Asian movies (like Indonesian) to be the scariest ever, but if you're not from Indonesia or Malaysia you won't get the same kind of scare and fear I think.

That's all I can think of at the moment.

I thought the concept behind Hostel was pretty terrifying. The thought that people could make a business out of killing for entertainment, and that if traveling through certain war-torn countries you could become a victim of it -- that stuck with me for days the first time I saw it.

I also thought The Strangers and Ils were scary. Something about home invasion does it for me.

The two girls in The Shining still creep me out every time I see them.

I also find insane asylums pretty freaky, although I'm having trouble thinking of a good movie example.