This is the scariest movie I have seen in a long time. It is perhaps the scariest film I've ever watched. The director did an amazing job with the tension and suspense, and I was hiding half my face for most of the movie.
I actually cried out when the old man appeared at the front door when the crew tried to escape the school.
I had to stop the movie halfway through the first time because I had to go to bed, and I knew I'd have to watch something pleasant before I could relax. I also was scared to look into any mirrors or out the windows.
I just finished the second half. I will now be paranoid for hours. Wow.