Longbottom, if brains were gold, you'd be poorer than Weasley, and that's saying something.

Honestly, if you were any slower, you’d be going backward.

Ginny, listen . . . I can’t be involved with you anymore. We’ve got to stop seeing each other. We can’t be together.” “It’s for some stupid, noble reason, isn’t it?

Don't be stupid, it's a flying house!

Ah, well, people can be stupid abou' their pets," said Hagrid wisely.

My parents are muggles, mate. They don't know nothing about no deaths at Hogwarts, because I'm not stupid enough to tell them.