Who is that guy?
4 seconds sound clip from the Back to the Future movie soundboard.
You can hear this line at 01:23:42 in the Blu-ray version of the movie.
Quote context
[...]
- You're going to break his arm!
- Biff! Biff, leave him alone! Let him go! Let him go!
- That's George McFly. That's George McFly?
- Hey, guys, you gotta get back in there and finish the dance.
- Hey, man. Look at Marvin's hand.
[...]