Memorable Quotes from The Time Machine (2002) – A good explanation of time-travel causalilty and why you can’t go back in time before a time machine was created (or decided upon): “You built your time machine because of Emma’s death. If she had lived it would never have existed, so how could you use your time machine to go back and save her? You are the inescapable result of your tragedy, just as I am the inescapable result of you.”