"So top grade's O for 'Outstanding,'" Hermione was saying, "and then there's A-" "No, E," George corrected her, "E for 'Exceeds Expectations.' And I'… - J.K. Rowling

"Why were you lurking under our window?"
"Yes - yes, good point, Petunia! What were you doing under our windows, boy?"
"Listening to the news," said Harry in a resigned voice.
His aunt and uncle exchanged looks of outrage.
"Listening to the news! Again?"
"Well, it changes every day, you see," said Harry.

Mr. Moony presents his compliments to Professor Snape, and begs him to keep his abnormally large nose out of other people's business.
Mr. Prongs agrees with Mr. Moony, and would like to add that Professor Snape is an ugly git.
Mr. Padfoot would like to register his astonishment that an idiot like that ever became a professor.
Mr. Wormtail bids Professor Snape good day, and advises him to wash his hair, the slimeball.

"I don't mean to be rude — " he began, in a tone that threatened rudeness in every syllable.
"Yet, sadly, accidental rudeness occurs alarmingly often," Dumbledore finished the sentence gravely.