Marty: "Come on, Doc. Did you see the way she was looking at you?"
Doc: "She did have quite a scare, right? After all, Miss Clayton almost ended up at the bottom of Clayton Ravine. Clayton, Ravine?"
Marty: "Holy, bleep! Hey, Doc! Clayton Ravine was named after a teacher. They say she fell in there a hundred years ago."
Doc: "A hundred years ago? That's this year!"
Marty: "Every kid in school knows that story 'cause we all have teachers we'd like to see fall into the ravine."
Doc: "Great Scott!"
Marty: "Then, she was supposed to go over in that wagon. And now, I may have seriously altered history."