Paranormal Activity is a 2007 American supernatural horror film produced, written, directed, photographed, and edited by Oren Peli. It centers on a young couple who are haunted by a supernatural presence inside their home. They then set up a camera to document what is haunting them. The film uses found-footage conventions that were mirrored in the later films of the series.
Originally developed as an independent feature and given film festival screenings in 2007, the film was shot for $15,000. It was then acquired by Paramount Pictures and modified, particularly with a new ending that cost an additional $200,000. It was given a limited U.S. release on September 25, 2009, and then a nationwide release on October 16, 2009.