Of course not, Biff. Now, I wouldn't want that to happen.
5 seconds sound clip from the Back to the Future movie soundboard.
You can hear this line at 00:13:14 in the Blu-ray version of the movie.
Quote context
[...]
- Hello? Hello? Anybody home? Huh?
- I got to have time to get them retyped.
- Do you realize 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? Would you?
- Of course not, Biff. Now, I wouldn't want that to happen.
- Not too early. I sleep in Saturday.
- McFly, your shoe's untied. Oh.
- Don't be so gullible, McFly.
- Got the place fixed up nice, though, McFly.
[...]