Was just sitting here reading about people argue about time travel being possible, and this occured in my mind, if you go back and change something about the past you wont even know you did it since that event would of never happened, and then you wouldn't have had to go back in time to change that event, so you would of never went back in time to change that event, which means it would still happen, which means you can't change the past with time travel. Sounds legit?