[WOW his mouth drops open in clear and exaggerated shock.]

Sorry, what? Is there someone else here that you were directing that toward? And I doubt you lived in a tin-roof shack, Miss Violin-and-Maths Prodigy, so I'll thank you to watch what you're saying.

[Almost said watch how you speak to me which would have sounded very rich-and-stuck-up so. Good job not saying that, Sirius.]