Synopsis for
The Butterfly Effect (2004) More at IMDbPro »

Evan Treborn (Ashton Kutcher), who suffered severe traumas as a boy (Logan Lerman) and a teenager (John Patrick Amedori), blacks out frequently, often at moments of high stress. While searching for an answer to heal his emotional wounds, he finds that when he reads from his adolescent journals, he travels back in time, and is able to essentially "redo" parts of his past, and thereby causing the blackouts he experienced as a child. There are consequences of his choices, however, that he then propagates back to the present; his alternate futures vary from frat boy to prisoner to amputee. As he continues to do this, he realizes that even though his intentions are good, the actions he takes have unintended consequences.