As John Carpenter's Halloween has already demonstrated, low budget horror movies have the potential to recoup the costs of production a thousand fold if they find the right audience - Paranormal Activity, produced on a significantly lower budget, took the ratio of budget to box office to entirely different heights. The premise is simple: young couple Katie and Micah move into their new home in San Diego and shortly after a series of strange supernatural occurences begin to disturb more than just their sleep. A found footage film, Paranormal Activity uses footage captured from handheld camcorders and other cameras positioned around the home to build up tension, as the presence of a demon becomes increasingly evident. Bare bones horror, but audiences lapped it up - as always, shame about the law of diminishing returns when it comes to the sequels... Budget: $15,000 Box office: $193.3 million