The Exorcism of Emily Rose (2005)

The fact that this film is based upon a true story is what makes it terrifying. The film is presented via the court case that took place investigating the cause of Emily's death. Her priest was accused of neglect, while he claimed she had been possessed by demons. More realistic than 'The Exorcist', the way Emily moves, acts and speaks when she is possessed is extremely disturbing. If possession is one of your fears, you'll definitely credit this as a horror. You can also listen to real recordings of the exorcism on youtube. http://www.youtube.com/watch?v=B0I3SAizRbk