Biff: Hello, hello, anybody home?
Biff taps George on the head.
Biff: Think, McFly, think. I gotta have time to get them retyped. Do you realise what would happen if I hand in my reports in your handwriting? I'll get fired. You wouldn't want that to happen would you?
George doesn't say anything.
Biff: Would you?
George: Of course not, Biff, now I wouldn't want that to happen. Now, uh, I'll finish those reports up tonight, and I'll run em them on over first thing tomorrow, All right?
Biff: Hey, not too early I sleep in on Saturday. Oh, McFly, your shoe's untied.
You wouldn't want that to happen would you?
Would you?そうなってほしくないだろ。と、相手にも無理やり同意させようと、would you?と繰り返し、反語的に聞き返してます。効果的に、付加疑問文にしてありますね。
Of course not, Biff, now I wouldn't want that to happen.