The Blair Witch Project ($60,000 budget)
It can be easy to forget just how groundbreaking The Blair Witch Project was because it was released over 20 years ago, in 1999, to be exact. The movie was created long before mockumentaries (footage of fictional events presented as documentaries) were a thing.
The movie’s marketing campaign was successful in that it made audiences question whether what they were watching was real or not. The film ended up making an impressive $248 million which makes it the most profitable movie of all time, with regards to percentage.