Answer:
Primer (2004) - Budget: $7,000
A staple of independent cinema, Primer was directed by, written by, produced by, and starring Shane Carruth, who also performed various other roles on his passion project. About two friends who accidentally discover time travel, this film does not hold the audience's hand, explaining the process in technical language that makes it seem like two experts are actually speaking to each other.Carruth made another low-budget classic in the form of Upstream Color in 2013, but Primeris more well known and is an example of the fact that massive budgets are not always necessary for brilliant projects to come to life.