http://en.wikipedia.org/wiki/The_Blair_Witch_P roject
The film was set up by a group of film students who used their won portable equipment, and 'starred' in their own documentary.
The clever part was creating a website in the infancy of websites, to create the legend that the film was 'true story'. because of the hype generated by the website and word-of-mouth, the film went on to gross millions.
Daniel Myrick - who enjoyed a sizable share of nearly $250 (and counting!) was asked what he was planing do for his next film.
He smiled and said "What next film?"