Quote Originally Posted by volthawk View Post
You hit someone so hard, they go back in time.
But what if you punch yourself, get sent back in time a few minutes, hide and wait for your future self to prepare to punch themselves, and then as they wind up, you leap out and grab their arm yelling "Stop hitting yourself!". However, having stopped yourself from going back in time, you're never there in the first place, so as you disappear, your arm is then released, punching yourself in the face to send you back in time again...