Sarah

“Curious indeed how these things happen. The wand chooses the wizard, remember...I think we must expect great things from you, Mr. Potter... After all, He-Who-Must-Not-Be-Named did great things — terrible, yes, but great.”
― J.K. Rowling, Harry Potter and the Sorcerer's Stone

“I’ll make Goyle do lines, it’ll kill him, he hates writing,” said Ron happily. He lowered his voice to Goyle’s low grunt and, screwing up his face in a look of pained concentration, mimed writing in midair. “I... must... not... look... like... a... baboon’s... backside.”
― J.K. Rowling, Harry Potter and the Order of the Phoenix

“Hermione launched herself forwards and started punching every inch of him that she could reach.
'Ouch — ow — gerroff! What the — ? Hermione — OW!'
“You — complete — arse — Ronald — Weasley!”
She punctuated every word with a blow: Ron backed away, shielding his head as Hermione advanced.”
― J.K. Rowling, Harry Potter and the Deathly Hallows

“Do you remember me telling you we are practicing non-verbal spells, Potter?"
"Yes," said Harry stiffly.
"Yes, sir."
"There's no need to call me "sir" Professor."
The words had escaped him before he knew what he was saying.”
― J.K. Rowling, Harry Potter and the Half-Blood Prince