Paranormal Activity...It was so realistic...It almost seemed unscripted
Kudos go directly Micah Sloat (playing Micah) and Katie Featherston (playing Katie) for keeping the movie refreshingly "real".
“One of the things I wanted to do was create something that people could say defined horror for their generation,” concludes Peli, “the way after ‘Psycho’ people said they would never take another shower; after ‘Jaws’ and ‘Open Water’ that they would never again swim in the ocean; and after ’Blair Witch’ that they would never again go camping in the woods. I figured, well, sleeping at home is something you can’t really avoid. So if I can make people scared of being at home, ‘Paranormal Activity’ might do something.” -Oren Peli (Producer)
I think it was pure genious.