superchunk on 11 December 2012
Different time lines is the key.
You wouldn't lose your leg and then that person's time line would shift allowing for all sorts of new things.
The you that went back in time would just live along in that same event.. probably richer as you should be smart enough to bring something back with you to use to gain financial superiority.
Finally total chaos as so many people would be coming back that shit would get all screwed up and while you fixed yourself from that one leg tragedy you have no clue what else is now going to happen. Really you just now have two selves living through some crazy shit.
