First of all, i'd stop the earth from spinning, suddenly, there would be chaos, and people flying by, whatnot... that would end with some of the population, then i'd make a planet sammich, making them all crash at incredible speed, then i'd end with life on this galaxy with the sun, making it toast everything up...
and for the rest of the universe, i'd make all the black holes to be in one place, apart from the carnage that would become when i crashed all the universes' suns togheter, pure epic, then i'd make all the stars go supernova, and all the remaining shut to crash with other shit, and a rain of meteors to the mass, and i'd get rid of the black holes, and i'd ensure the beginning of a new era, by making everything blow up, as the Big Bang.... then, i'd make a world of furries, and another of humans, and they would be neighbor planets, and i'd incarnate in my fursona! Wahahaha! i just killed the whole paragraph!!!