and his best student:
He'd said he'd forgiven me for what I'd done to his mortar, but Slughorn thinks that the occasional explosion helps his students retain their lessons. I said, "I want to see you do it first."
"Oh, come on. You've got a natural instinct, my boy. Have a go."
"My instinct says no."
He sighed and smacked the cauldron a couple of good ones. The potion blurped and fizzed and when he put his spoon into it, it didn't explode at all. "Uh-huh," I said. "Exactly."
"Such a smart boy. No fun at all though."