The Tooth Fairy slasher/chase that kind of stuff...
The Serbian Movie it's not really a horror...but its more...complete mind rape/you will never forget this movie kind...tho I warn you it has some VERY VERY strong scenes...(Im not kidding)
And a friend said that that new Chernobyl movie that came out I think last month is good as well. And you can give it privately, make it a giveaway or anything it's your choice, but you just cant abuse/go over the rules.

Edit: There is also a movie thats based on Brazil, and there are tourists that come and visit and then we sell their organs and stuff, its pretty good as well. No idea the name tho.

The last I knew was V/H/S, it's like a compilation of mini-movies, or something like that, haven't saw it yet

Twilight series. Serious shit.

Your set for life - Cinemassacre

Behind the Mask: The Rise of Leslie Vernon - a fauxumentary/comedy about a serial killer. Brilliant when he's showing all the painstaking setup + predictions for how people will react in a stereotypical 'teens in a house in the woods' scenario.

Tucker and Dale vs Evil is a pretty good comedy horror. It's not scary but is quite gory.

pretty much all of Sam Raimi movies are good (evil dead, army darkness Darkman is ok (yes i know spiderman aint horror)), other than that Hellrazor movies, Gingerdead Man, Puppet Master,

Rubber. Rubber tire horror. http://www.rubberthemovie.com/

Watch the trailer.

The Priest its a vampire movie thing

Evil Dead Series (Dark Comedy)

If you like a hillbilly sort of horror movie. Heres 1. Wrong Turn 3: Left for Dead

I'm not really a fan of Modern horror movies(serial killers, plagues etc) since I don't find murderers scary but I do recommend some Asian horror Films. The storyline can get pretty pathetic, but the shock scenes are pretty scary since I know you guys aren't used to them. I recommend The Eye or Ringu(1998)

A Tale Of Two Sisters. Properly scary Korean Horror (Disturbing). Pretty remenicient of The Ring and The Grudge.

The Ring

case 39, don't know whether it actually is horror, but it's something like 'the omen', devilsh kids ftw! :p

These are not the scariest or best produced movies but they should entertain you if you're running out of things to watch:

The Strangers ((Slasher / Disturbing with Liv Tyler)

Plot:
A young couple staying in an isolated vacation home are terrorized by three unknown assailants.

Funny Games (Slasher / Disturbing)

Plot: Two psychopathic young men take a family hostage in their cabin.

Pontypool (Zombie/Disturbing)

Plot: A psychological thriller in which a deadly virus infects a small Ontario town.

(This one is pretty original, the story mostly takes place inside a radio station and the events are described by callers, I recommend it).

Insideous its a disturbing one i guess but its good you should check it out.

Jeepers Creepers 1 and 2(Simply horror)
If you haven't seen them yet,do it NOWWWWWW
Can't wait for the third movie D:

Paranormal Activity is a good found footage horror. Watch it at 2AM with lights off, all doors in the room open, and with a girl.

Also, I think this will be good when it comes out: V/H/S (NSFW Redband trailer)

Try to watch this when you're alone in the dark room at night, like I did some years ago. Unforgettable. (American remake is strongly inadvisable)

Dawn of The Dead , 28 Weeks Later , A Nightmare on Elm Street , Exorcism (Emily Rose & True Story) <<< Zombies , Twisted Nightmares , and Based in True Story (aka only exorsism)

if u throw them keys ill catch it :3 ...

The host
It's not scary but it's a monster film and I quite enjoyed it.

Tucker and Dale vs. Evil - satire maybe, not really a comedy but... it's Tucker, and Dale...
The Thing - if you haven't seen it, it should be the top of your list
Evil Dead / Evil Dead 2 / Army of Darkness - what I like to call rowdy horror
The Walking Dead - not a movie, series on AMC but absolutely cool
There was an old slasher movie, I can't remember the name but on the jacket it says "by pick, by axe, bye-bye" - really good
Pumpkinhead - old monster movie, worth a watch if you haven't seen it (don't bother with the sequels)
the original Dawn of The Dead and especially Day of The Dead
Bad Taste - old parody gore/horror (aliens, exploding cows, etc)

Black sheep (horror comedy)

TREMORS (I can't believe I forgot this one, classic monster movie)

CRITTERS

JAWS

Children of the corn

Botched (horror/comedy) Trailer

Severance (horror/comedy à la Shaun of the dead a bit) Trailer

All Stephen King movie adaptations (Cujo, Carrie, Christine, Misery, etc.)

Room 1408 (with John Cusack and Samuel l Jackson) - already mentioned

The Hills Have Eyes

The TEXAS CHAINSAW MASSACRE + The Beginning (prequel) : need I say more?

Friday the 13th

Halloween

Alien Quadrilogy (my all time favorite series)

There was also this really good TV show called "Masters of Horror", you can probably find it one way or another on the Net. And of course "The Outer Limits" and "The X-Files" though these are not really scary.

That should get you started :D

BONUS: hilarious Shaun of the Dead outtakes