If you're a Harry Potter fan, then chances are you've taken J.K. Rowling's Pottermore Sorting Quiz, which, well, does just that—it sorts you into one of four Hogwarts houses. Many people take their result just as seriously as their horoscope sign or their stance on pineapple on pizza—it becomes part of their identity and personality trait.
However, this result must be taken with a grain of salt, because there's a bath bomb that might effectively re-sort you...