At once, Hermione Granger's voice seemed to fill his head...

Hermione made a loud tutting noise. She reached up and pulled Harry back into his seat. "Honestly!" she said.

"And that, boys," yelled Mr. Weasley over the tumult of the crowd below, "is why you should never go for looks alone!" (note: not H/Hr related, but I just love this quote!)

"What's that supposed to mean?" said Hermione defiantly.
"Granger, they're after Muggles," said Malfoy. "D'you want to be showing off your knickers in midair? Because if you do, hang around. . . they're moving this way, and it would give us all a laugh."...

Philosophers Stone
"Harry Potter," said Harry.
"Are you really?" said Hermione. "I know all about you, of course -- I got a few extra books for background reading, and you're in Modern Magical History and The Rise and Fall of the Dark Arts and Great Wizarding Events of the Twentieth Century."
"Am I?" said Harry, feeling dazed.

But Hermione had given Harry something else to think about as he climbed back into bed.
As they jostled their way through a crowd of confused Hufflepuffs, Harry suddenly grabbed Ron's arm.
"I've just thought -- Hermione."
"What about her?"
"She doesn't know about the...