Lorraine, you ever have a kid who acts that way, I'll disown you.
5 seconds sound clip from the Back to the Future movie soundboard.
You can hear this line at 00:47:43 in the Blu-ray version of the movie.
Quote context
[...]
- And he can sleep in my room.
- He's a very strange young man.
- He's an idiot. Comes from upbringing. His parents are probably idiots, too.
- Lorraine, you ever have a kid who acts that way, I'll disown you.
- Doc?
- Doc? (2)
- I don't wanna know your name. I don't want to know anything about you.
[...]