I still don't understand how am I supposed to go to the dance with her if she's already going to the dance with you?
10 seconds sound clip from the Back to the Future movie soundboard.
You can hear this line at 01:12:32 in the Blu-ray version of the movie.
Quote context
[...]
- Wow, you mean... You mean nobody's asked you?
- He's kind of cute and all, but not...
- Well, I think a man should be strong, so he can stand up for himself and protect the woman he loves.
- Yeah.
- Well, because, George, she wants to go with you. She just doesn't know it yet.
- That's why we got to show her that you, George McFly, are a fighter.
- You're somebody who's gonna stand up for yourself, somebody who's gonna protect her.
- Yeah, but I've never picked a fight in my entire life.
- Look, you're not going to be picking a fight, Dad.
[...]