About "return to the past to fix everything". I like the movie "The Butterfly Effect". Who did not watch - there the main character learned to return to some moments of his life and do everything differently (in the end his life changed). And every time it turned out to be silly - then without hands will remain, then in jail will sit, then a friend in a psychic will be cared for, and a girlfriend will become a prostitute. A good film that answers the question "what would it be if it were done differently".