Katie

“Lee Jordan was finding it difficult not to take sides.
'So — after that obvious and disgusting bit of cheating —'
'Jordan!' growled Professor McGonagall.
'I mean after that open and revolting foul —'
'Jordan, I'm warning you —'
'All right, all right. Flint nearly kills the Gryffindor Seeker, which could happen to anyone, I'm sure, so a penalty to Gryffindor, taken by Spinnet, who puts it away, no trouble, and we continue play, Gryffindor still in possession.”
― J.K. Rowling, Harry Potter and the Sorcerer's Stone

“Can't stay long, Mother," he said. "I'm up front, the prefects have got two compartments to themselves-"
"Oh, are you a prefect, Percy?" said one of the twins, with an air of great surprise. "You should have said something, we had no idea."
"Hang on, I think I remember him saying something about it," said the other twin. "Once-"
"Or twice-"
"A minute-"
"All summer-"
"Oh, shut up," said Percy the Prefect.”
― J.K. Rowling, Harry Potter and the Sorcerer's Stone

“Fred and George, however, found all this very funny. They went out of
their way to march ahead of Harry down the corridors, shouting, "Make way for
the Heir of Slytherin, seriously evil wizard coming through ......

Percy was deeply disapproving of this behavior.

"It is not a laughing matter," he said coldly.

"Oh, get out of the way, Percy," said Fred. "Harry's in a hurry."

"Yeah, he's off to the Chamber of Secrets for a cup of tea with his fanged
servant," said George, chortling.

Ginny didn't find it amusing either.

"Oh, don't," she wailed every time Fred asked Harry loudly who he was
planning to attack next, or when George pretended to ward Harry off with a large
clove of garlic when they met.”
― J.K. Rowling, Harry Potter and the Chamber of Secrets

“I nodded, looking at Rachel with respect. "You hit the Lord of the Titans in the eye with a blue plastic hairbrush.”
― Rick Riordan