The Blair Witch Project; Low Budget Films. 

The Blair Witch Project is an extremely successful low budget film, using around $60,000 for the whole film to be produced, but the film itself ended up making $249 million. There are several different ways in which it's low budget is shown both in the film itself, and by looking into the production side of it. For example, it took eight days to film, not all of the people who played a part in the film were actual trained actors, it barely followed a script, in fact, each main character played fictionalized versions of themselves, after being told to mostly improvise.