Our universe is the place we're meant to be, so that makes it different than any of the five bazillion other places. It's not like anyone comes here going, "Oh hey, Caroline, you're Elena's best friend? She totally crashed my universe!" Cause if someone had ever come to mine who shouldn't, that would have been the first thing on my mind. And if it were going to be random, I'm pretty sure someone would've gone to one of the other ones people come from here. And suddenly Star Trek would have vampires or True Blood have superheroes.