Cameron's Aliens (1986), Lost Highway (1997), Blair Witch (1999), Blair Witch 2 (2000), My Little Eye (2002),  Red Road (2006), The Poughkeepsie Tapes (2007),  REC (2007), Paranormal Activity (2007), and  Paranormal Activity 2 (2010).  All hinged on the assumption that there is a reality beyond our senses, evident to the camera, but not to us.