"That's okay! It might come back to you, but you - you'll be fine, anyway." He stopped himself saying might not want to know. "The Houses... it's an old-fashioned boarding school thing. In practice I don't think anyone pays much attention to it apart from deciding what dormitory to live in, but there are four Houses - Gryffindor, Ravenclaw, Slytherin and Hufflepuff -" he wasn't really aware of the other ones "- and which one you're sorted into depends on your personality, what's important to you. Gryffindor if you're brave, Ravenclaw if you're intelligent, Slytherin if you're ambitious and Hufflepuff if you're loyal and hard working."