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The Butterfly Effect is a 2004 American fantasy/drama movie starring Ashton Kutcher, Amy Smart, Eric Stoltz, and others, distributed by New Line Cinema. The title is a reference to the butterfly effect, which theorises that a change in something seemingly innocuous, such as a flap of a butterfly’s wings, may cause unexpected larger changes in the future, such as a tornado. The Butterfly Effect is directed and written by Eric Bress and J. Mackye Gruber.