Rubeus Hagrid: If that dolt of a cousin of yours, Dudley, gives you any grief… you could always… threaten him… with a nice pair of ears to go with that tail of his.

Harry Potter: But Hagrid, we’re not allowed to do magic away from Hogwarts. You know that.

Rubeus Hagrid: I do. But your cousin don’t, do he?

From Harry Potter and the Sorcerer’s Stone (2001)