Time travel could not exist, I have proof.

Or maybe you're living a life that is actually a reality TV show and you're the only one who doesn't know it. Your family and friends are all actors. We're just the producers' assistants posting on here because we get paid extra if we do. All around you are hidden cameras. Time travel exists but the producers decide not to add it in because of certain complications time travel would place on the film crew and set designers. Or not.