I recently watched and enjoyed
Mr. Nobody, a science fiction film about the last mortal human (Nemo Nobody) on Earth as he approaches his death at the age of 117.
Nemo tries to tell the story of his life to a psychiatrist and a journalist. However, his stories massively contradict each other.
The film discusses chaos theory, string theory, and the butterfly effect a lot.
It's got a 7.9 on IMDB and has earned a reputation as a cult film.