Suggest me a good horror movie!

Insidious was pretty good. Had parts that made me jump.

The Room

I'll let you know when I find one.

Mama is not bad.

From the last two years I suggest you Insidious, Cabin In The Woods, Lords Of Salem and the remake of Evil Dead.

Noroi: The Curse, or something from here.

Noroi: The Curse is a very good J-Horror movie. One of the only movies that freaked me out. I say "freaked" because no horror movie has ever "scared" me. I just don't find horror movies scary, although, I have been in search for a scary horror for quite some time now.

V/H/S was a pretty decent horror flick.

I recommend Zombie Ass: Toilet of the Dead.

not really

Edit: how about Rape Zombie: Lust of the Dead
wtf are the Japanese doing???

Showgirls, absolutely terrifying!

That guy in Pan's Labyrinth was scary...

Insidious !! :D

Watch either "Splinter", "The Signal", or "Pontypool"...TRUST me

After Earth. Oh the horrors!

The Exorcist, Texas Chainsaw Massacre(1974), Suspiria(awesome atmosphere)

Rubber.

Sinister, Dark Skies was pretty descent

Stake Land, Pontypool, Pandorum (sci-fi/horror), In The Mouth Of Madness (if you like Lovecraftian setting).

Event Horizon

13 ghosts (2001) :)))

Switchblade romance. Dont read any reviews or anything, as they could spoil the twist for you.

Any Nicolas Cage movie.

Birdemic: Shock and Terror

Insidious, Sinister and Evil Dead remake were all already written (but those are the best of modern hollywood horror).
First SAW is not a bad movie (2 and 3 are still worth watching), but I wouldn't say they scared me. Same with Final Destinations.
The Collector and The Collection if you are into torture and those things.
Dawn of the Dead remake is a good zombie movie (Romero's originals are very good too).
If you prefer classics there is Misery.
Really depends on what you want to watch.