- You wouldn't.
- Wouldn't I?

2 seconds sound clip from the Back to the Future Part II movie soundboard.

You can hear this line at 00:48:48.063 in the Blu-ray version of the movie.

Quote context

[...]

- So go ahead. But think about this, Lorraine!

- Who's gonna pay for all your clothes, huh? And your jewelry and your liquor?

- Who's gonna pay for your cosmetic surgery, Lorraine?

- You were the one who wanted me to get these things. If you want them back, you can have them.

- Look, Lorraine. You walk out that door, and I won't only cut off you. I'll cut off your kids.

- You wouldn't.

- Wouldn't I?

- First your daughter, Linda. I'll cancel all her credit cards. She can settle her debts with the bank all by herself.

- Your idiot son, Dave. I'll get his probation revoked. And as for Marty...

- Well, maybe you'd like to have all three of your kids behind bars, just like your brother Joey.

- One big, happy, jailbird family.

[...]