" Harry: This book belongs to Harry Potter.
Ron: Shared by Ron Weasley, because his fell apart.
Hermione: Why don't you buy a new one then?
Ron: Write on your own book, Hermione.
Hermione: You bought all those dungbombs on Saturday. You could have bought a new book instead.
Ron: Dungbombs rule. "

― , Fantastic Beasts and Where to Find Them (Hogwarts Library)