So much this. Also there's one called Sinister. The first Insidious movie was pretty good iirc, and finally The Cabin in the Woods was awesome (for an entirely different reason. Just watch.)
Dunno if this really has no efects in it (they claim it to be a real experience), check out Bangunan bro in youtube. Sort of a horror documentary
tower of karma it's not a movie but it's messed up all copies of this should be burnt with fire and then launched into a sun about to go supernova and the black hole left by the explosion should be shot with a 40m sized rocket shaped like a fist loaded with nukes with the words "you need Jesus " imprinted on it while also carrying a load of holywater,bibles,Qurans,and other religious objects
The Last Air Bender. It will horrify you to the core and cause you to repress every moment you spend watching it from fear of remembering it exists as it slowly ruins every childhood memory you have of the books or the anime. http://www.imdb.com/title/tt0938283/