R | | Drama, Sci-Fi, Thriller
Evan Treborn suffers blackouts during significant events of his life. As he grows up, he finds a way to remember these lost memories and a supernatural way to alter his life by reading his journal.
The title is a reference to a concept in Chaos Theory whereby small events may lead unpredictably to large events. This is explained in the opening quotation which explains that a butterfly flapping its wings may result in a typhoon. It may also be seen secondarily as a reference to the short story, "A Sound of Thunder", by Ray Bradbury.
If anyone finds this, it means my plan didn't work and I'm already dead. But if I can somehow go back to the beginning of all of this, I might be able to save her.
When Evan falls off the couch, after being hypnotized, there are some blood spots on the front of his shirt. just before the scene is over, the blood spots are gone.
The title, "The Butterfly Effect," is superimposed over a depiction of a butterfly beating its wings, which is itself superimposed upon an X-ray profile of a human brain.
The Canadian version of the movie contains scenes of nudity.
$17,065,227 (USA) (25 January 2004)