Verified answer

Well you can watch insidious. There's a point where yeah sure it doesn't scare you but if u saw those things right infront of u standing and looking at you then that's a different story. Watch insidious and that demon in there is scary...I think it's scary because I consider this : if it could happen in real life and thet are waiting about and showing some real stuff then it's a scary movie. I think I probably got a nightmare from that but I pay no attention to nightmares so yea

Event Horizon is the scariest movie that I have seen, in my 31 years. There is just something about that particular science fiction movie that startles that mind and leaves it scared.

Best of luck.

The Exorcist (early 70s) - nothing like it had ever been made. So, it pushed the envelope in a big way.

There are 2 films mostly scariest

1408 (2007) - http://www.imdb.com/title/tt0450385/

Arundhati (2009) Telugu

you can use english subtitels for telegu movie