One day, Earth burst into darkness from a big bang that some people like to call GOD...and let's throw the word theory in there too. It pushed it's way past six other planets before settling down happily in a spot not too hot and not too cold. Earth grew round and fat with it's dependence on the Sun, but don't mention this or it'll denounce you as a planet. Earth has never had a very good sense of humor, it's a Scorpio.
It hit puberty early on, before any other planet, and began to grow grass, gain water, and build a sky that might or might not be just a reflection. From the Earth grew creatures; all kinds of creatures, all aware of each other but not of themselves. This way things like vanity and buying things for yourself that you don't need wouldn't become a problem. Eons of evolutions later, plus a garden and a snake (it makes sense by pretending), came a creature very much like all the others but a little less complete. It didn't really make much sense, it was too tall and had too many fingers; humans. The human was curious and very insecure. It rubbed it's elbow too much and the other creatures didn't really like that it had patches of hair in the oddest of areas. Obviously it was ill. Survival of the fittest, and Darwin, would make sure the creature died during the Winter. Finally, the human gained enough courage to move; it was hungry and instinct told it movement was necessary. Oh instinct. The first step taken was a badly calculated one, as the human, before instinct kicked in, hadn't really done much of anything, especially not calculations. It fell hard and many creatures laughed without knowing why, others didn't really understand what had happened. See, humans were the first creatures to ever trip.
So, that morning of January fifth, thousands and thousands of years later, it was really no surprise at all, or chance bad luck, when Samantha Gray came hurling out of her apartment building, like she hadn't discovered how to use her legs yet, and slammed right into another human being; it's in her genes.