It is said that despite girls being allowed to enter boys' dormitories in Hogwarts, boys are not allowed to enter the girls' dormitories due to an outdated rule. However, if a boy ever tried to climb the stairs of the girls' dormitories, it is said that since it is enchanted, a screeching horn would suddenly go off, and the stone staircases would immediately turn into a stone slide and slide off the boy to the bottom of the stairs, preventing him from entering the dormitories.