Hannah

“a man travels back in time and murders his grandfather, thus preventing his own birth, the universe simply carries on with the grandfather dead, the time traveler forever unborn, and it does so without a care in the world as to how that murder was possible in the first place. No one will ever be aware that history has changed, and no one will ever be aware that he was supposed to have offspring, and grand-offspring. No one, that is, except the time traveler. That person, who should now never have existed, continues to exist anyway. And again, the universe just shrugs it off, insisting—and rightly so—that it owes no one any explanation for its conduct.”
― Edward Aubry, UnHappenings