The 19 Best Horror Movies of the 2000s

Security cam movies are part of the scary-film canon, but that hasn't always been the case. Paranormal Activity basically invented this trope, unsettling American moviegoers and making them suspicious of their own security systems. This movie has spawned countless spin-offs and created a vast franchise, and each one banks on the fright that unseeable, sinister forces can create. The bits set in the bedroom are the absolute spookiest parts of this movie.