I would travel back in time and kill my father. I would have never been born and by never have been born i wouldn't have gone to the past to kill my father and because of that infinite time loop the universe would implode.
I'd choose to plan my own assassination. Then I would pretend to be very defenseless to the sniper but it would really be a cardboard me. Then I'd would kill the sniper and on accident fall onto a tree and break a branch then fall and have lot's of luck and survive. Then I would try again until I die of my various.
I'd invite my friends and family around and feed them a lovely dinner. Once it was over, I'd wheel out a T.V. with a video of me telling them it was me they'd just eaten.
I'd walk out into the yard just as a meteor happend'd to hit the earth.I was alright except there was a massive partialy zombified(yet some how still alive) mutant in the meteor.It then tried to crush me with it's giant skull club, except another alien appeard sudennly.It instatly fazered the zombie.Then, ti bulled out a water pistol and shot me to death.