"It's a disgusting thing to call someone," said Ron, wiping his sweaty brow with a shaking hand. "Dirty blood, see. Common blood. It's ridiculous. Most wizards these days are half-blood anyway. If we hadn't married Muggles we'd've died out."
The Leaky Cauldron is not associated with J.K. Rowling, Warner Bros., or any of the individuals or companies associated with producing and publishing Harry Potter books and films.
"The Leaky Song" by Brad Mehlenbacher of Draco and the Malfoys