Paranormal Activity

Oren Peli's Paranormal Activity is the most profitable film in Hollywood history relative to its budget, and it earned every cent through pure, distilled dread. The found-footage format — static bedroom camera, timestamp ticking, couple sleeping while something moves in the darkness — taps into a primal fear that no amount of CGI could replicate: the terror of what happens while you sleep. The escalation is masterful. Each night gets worse, each disturbance more aggressive, and the timestamp becomes a countdown to something unbearable. The film single-handedly launched the found-footage boom of the late 2000s and proved that horror's most powerful tool is not money — it is imagination.