Arthur Weasley's Patronus is a weasel, and is first seen in Harry Potter and the Deathly Hallows when Ron's father uses it to send a message to Harry. Arthur Weasley isn't the best when it comes ...

Of course, Ron himself seemed to imply that any old Parseltongue sound would do. Consistent and rigorous magical worldbuilding isn’t exactly the strong suit of the Harry Potter franchise ...