I watched this movie when I was 5 years old with my family, and to this day, as a 17 year old, it terrifies the hell out of me. Insidious, in my opinion, has the best soundtrack I've ever heard in ANY horror movie that I've ever watched. Absolutely terrifying. The demons, plot, climax...everything had and still has me on edge. I also love how the movie doesn't use any religious aspects to help fight the demons and entities, like most horror movies do. Insidious is a horror masterpiece.