Ron: Dad loves muggles, he thinks they're fascinating.
Ron: Enlighten me. Why are we brewing this potion in broad daylight, in the middle of a girls' lavatory? Don't you think we'll get caught?
Ron: Why spiders? Why couldn't it be 'follow the butterflies'?
Ron: Follow the spiders. Follow the spiders. If Hagrid ever gets out of Azkaban, I'll kill him.
Ron: They were starving him, Mum. There were bars on his window.
Mrs. Weasley: You'd best hope I don't put bars on your window, Ronald Weasley.
Ron: You'll pay for that one Malfoy! Eat slugs!
[Ron's spell backfires, causing him to spit up slugs]
Ron: Bloody hell. Whoever shed this [snake skin] must be 60 feet long, or more.
[Gilderoy Lockhart passes out]
Ron: [to Harry] Heart of a lion, this one.
Ron: Oh, that'd be a cheerful visit. "Ello Hagrid! Tell us, have you been setting anything mad and hairy loose in the castle lately?"
Ron: [in the spider's hollow] Can we panic now?
Ron: [repeated line] Bloody hell!