I devote millions and years of my life to the creation of a time machine, so that-through a complex plot so amazing that revealing even the smallest detail would literally blow your mind- arrange it so that you become your own grandfather, thus creating a space/time paradox so volatile that it forces the universe to shove your existence under the carpet like so many dust bunnies.
Wait, Avatar? Uh...
Go Schwaurtzaflooger on you until you self destruct?