"I think Divination seems very woolly." Hermione said in a cool tone. "A lot of guess work, if you ask me."
"Well, what about Mayumi, then?" Ron gestures violently towards the girl, "there's nothing woolly about her predictions, are there?"
"Excuse me," Mayumi gives Ron a flat look, "I definitely haven't been using Divination." She paused, "If I did, I'd be poor."
"Then what are you using?!" Ron demands.
"A good memory and the qualities of a nerding fangirl."