George McFly: [deleted scene]
[after looking at his watch George rushes to the phone booth and calls the operator]
George McFly: Operator! Operator, can you give me the time?
[a few students come and block him in the phone booth with a trident]
George McFly: Dixon, I got to get out! Dixon, this isn't funny! What? Dixon!
[the students laugh as they walk away]
George McFly: [Mr. Strickland walks by and sees George inside the phone booth] Mr. Strickland, those no-good guys, they just locked me in.
Mr. Strickland: You see. You see what happens to slackers, McFly?
[walks away]
George McFly: Yes. Yes! Mr. Strickland, you've got to let me out of here!