I feel like a house-elf," grumbled Ron [general cleaning of Black's house]

"Well, now that you understand what dreadful lives they lead, perhaps you'll be a bit more active in S.P.E.W!"

...

"You know, maybe it wouldn't be a bad idea to show people exactly how horrible it is to clean all the time -- we could do a sponsored scrub of Gryffindor common room, all proceeds to S.P.E.W, it would raise awareness as well as funds --"

"I'll sponsor you to shut up about spew," Ron muttered irritably.

Okay, write that down," Hermoine said to Ron, pushing his essay and a sheet covered in her own writing back to Ron, "and then copy out this conclusion that I've written for you."

"Hermoine, you are honestly the most wonderful person I've ever met," said Ron weakly, "and if I'm ever rude to you again --"

"-- I'll know you're back to normal," said Hermoine.

How would it be," she asked them coldly as they left the classroom [Prof Binns, History subject], "if I refused to lend you my notes this year?"

"We'd fail our O.W.L.s," said Ron. "If you want that on your conscience, Hermoine..."

"Well, you'd deserve it," she snapped. "You don't even try to listen to him, do you?"

"We do try," said Ron. "We just haven't got your brains or your concentration -- you're just cleverer than we are -- is it nice to rub it in?

Always the tone of surprise.

We should get a move on you know... ask someone. He's right. We don't want to end up with a pair of trolls."
Hermione let out a sputter of indignation. "A pair of... what excuse me?"
"Well - you know," said Ron shrugging. "I'd rather go alone than with - with Eloise Midgen, say."
"Her acne's loads better lately - and she's really nice."
"Her nose's off-centre," said Ron.
"Oh I see," Hermione said bristling. "So basically you're going to take the best-looking girl who'll have you even if she's completely horrible?"
"Er - yeah that sounds about right." said Ron.
"I'm going to bed," Hermione snapped and she swept off toward the girls' staircase without another word.

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.