Someone could wish the whole world different, if she really tried. You could have a world without shrimp, or a world with nothing but shrimp. You could even make a world where everyone was happy, and no one died, not even once. In this world, Buffy Summers does not drown at sixteen.
Teen, wishverse. I just re-watched The Wish and got this hankering to find out more about that Buffy. Turns out she’s not quite the lone wolf she seemed in the ep. 
(And like the fic, we’ll ignore the inevitable ending.)