Starring Ashton Kutcher and Amy Smart the title refers to the butterfly effect, a popular hypothetical situation which illustrates how small initial differences may lead to large unforeseen consequences over time. According to the Wikipedia entry: "Kutcher plays 20-year-old college student Evan Treborn, with Amy Smart as his childhood sweetheart, Evan finds he has the ability to travel back in time to inhabit his former self (that is, his adult mind inhabits his younger body) and to change the present by changing his past behaviors. Having been the victim of several childhood traumas aggravated by stress-induced memory losses, he attempts to set things right for himself and his friends, but there are unintended consequences for all."
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