Have you ever wondered what the top most profitable movies are? Sure, Avatar broke box office records with its billion dollar return, but it also cost hundreds of millions of dollars to make—courtesy of James Cameron's groundbreaking 3D technology. Compare that to a low-budget film, like Paranormal Activity, for example, which used unknown actors and pretty much filmed within a week. It made $107.9 million at the box office – chump change compared to Avatar's profit – but Paranormal's return on investment was a whopping 719,458% thanks to its $15,000 budget.
