The sorting hat is always right. In some ways, one could say it can see into the future. See what kind of person you grow up to be; the things you'll say and do; the places you'll go. It is by far, the smartest hat in the world. At the beginning of some students' lives at Hogwarts, they resent the sorting hat. Tearing up friendships, being placed in the "wrong house"; not honouring the family tradition. But it all works out in the end.
Welcome to Hogwarts School of Witchcraft and Wizardry.