I agree, Fred and George's exit in OotP is uncontested. But I also like particular passages in other HP books:
Philosopher's Stone
Everybody finished the song at different times. At last, only the Weasley twins were left singing along to a very slow funeral march.
Chamber of Secrets
"A Study of Hogwarts' Prefects and Their Later Careers," Ron read aloud off the back cover. "That sounds fascinating."
Prisoner of Azkaban
"Would anyone like me to help interpret the shadowy realms within their orb?"
"I don't need help, it's obvious what this means: there's going to be loads of fog tonight."
Goblet of Fire
Dudley had done the thing he was threatening to do since age three: He had become wider than he was tall.
Half-Blood Prince
"Do you remember me telling you we are practicing nonverbal spells, Potter?"
"Yes," said Harry stiffly.
"Yes, sir."
"There's no need to call me 'sir,' Professor."
Deathly Hallows
“And as for this book,” said Hermione, “The Tales of Beedle the Bard … I’ve never even heard of them!”
“You’ve never heard of The Tales of Beetle the Bard?” said Ron incredulously. “You’re kidding, right?
“No, I’m not!” said Hermione in surprise. “Do you know them, then?”
“Well, of course I do!”
Harry looked up, diverted. The circumstance of Ron having read a book that Hermione had not was unprecedented.
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