Sandy: No, Danny!
Danny: Sandy, don't worry about it, nobody's watching.
Sandy: Danny, get off me!
Danny: Come on, Sandy, what's the matter with you? I thought I meant something to you!
Sandy: Meant something to you! You think I'm going to stay here with you in this? this sin wagon? You can take this piece of tin!
Danny: Sandy, you just can't walk out of a drive-in!
Danny: That's cool baby, you know how it is, rockin' and rollin' and what not.
Sandy: Danny?
Danny: That's my name, don't wear it out.
Sandy: What's the matter with you?
Danny: What's the matter with me, baby, what's the matter with you?
Sandy: What happened to the Danny Zuko I met at the beach?
Danny: Well I do not know. Maybe there's two of us. Why don't you take out a missing person's ad? Or try the yellow pages, I don't know.
Sandy: You're a fake and a phony and I wish I never laid eyes on you!
Answer: Watched that scene again now and I just think it was poor writing (in what's still a classic film regardless). How none of the judges noticed that Cha Cha took another girl's (Sandy's) place even after she'd already been "tapped out" is another huge plot hole. Plus a lot of people in America were watching the dance on TV and it's not mentioned by anyone after this scene. 35 years later and that scene still bugs me (haha).