“How d’you spell ‘belligerent’?” said Ron, shaking his quill very hard while staring at his parchment.  “It can’t be B — U — M —”

“No, it isn’t,” said Hermione, pulling Ron’s essay toward her.  “And ‘augury’ doesn’t begin with O — R — G either.  What kind of quill are you using?”
“It’s one of Fred and George’s Spell-Check ones . . . but I think the charm must be wearing off. . . .”

“Yes, it must,” said Hermione, pointing at the title of his essay, “because we were asked how we’d deal with dementors, not ‘Dugbogs,’ and I don’t remember you changing your name to ‘Roonil Wazlib’ either.”

“Ah no!” said Ron, staring horror-struck at the parchment.  “Don’t say I’ll have to write the whole thing out again!”

“It’s okay, we can fix it,” said Hermione, pulling the essay toward her and taking out her wand.

“I love you, Hermione,” said Ron, sinking back in his chair, rubbing his eyes wearily.

Hermion turned faintly pink, but merely said, “Don’t let Lavender hear you saying that.”

Harry Potter and the Half-Blood Prince – J.K. Rowling