Really good scary movies?

[Alteration]

Ok but seriously

2001: A Space Odyessy was pretty creepy at some points (though it's not a horror movie so yeah)

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REC

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[Moppy]

Space Jam.
Oh man space jam.

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Space Jam.
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[Jake White]

SLEEPAWAY CAMP

WATCH IT

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[dkamm65]

REC

This.

It's best if you don't know anything about it before watching it. That's what I did. The only thing I knew about it before starting it was that it was a horror movie. It really adds to the experience.

[Axolotl]

My sister got scared of The Woman In Black

[BubbaGum]

My sister got scared of The Woman In Black

stupidest movie ever
please dont

[Kevdude]

Maybe Prometheus
Amityville Haunting

No. The rest of your list was good

Ok but seriously

2001: A Space Odyessy was pretty creepy at some points (though it's not a horror movie so yeah)

2001 was scary in the way movies are supposed to. It makes you feel completely alone(You're pretty much stuck with Dave for most of the movie,) the villain was inhuman and unreasonable(HAL, omg,) and it's beautiful

Please don't watch any of those found footage stuffballs

[morningstar]

None, they are all the exact same thing. 
"Oh, let's go into the condemned house people die in." 
"OH FREEFALLING FLYING FUDGE, A POOPCANNON MONSTER!"
Ded

[plad101]

The Shinning.

[Harm94]

Signs.

[Dominator]

Thomas the Tank Engine

[Harm94]

Thomas the Tank Engine

[hankyje]

This.

It's best if you don't know anything about it before watching it. That's what I did. The only thing I knew about it before starting it was that it was a horror movie. It really adds to the experience.

I'm really into slenderman mythos. I found it after finding out about slenderman