Marty: This thing doesn't fit.

Doc presses the button. The jacket modifies so it fits Marty.

Computerised Voice in Jacket: (v.o) Size adjusting, fits.

Doc: Pull out your pants pockets. All kids in the future wear their pants inside out.

Marty does so. Doc goes back into the bag and pulls out a cap.

Doc: Put this on.

Doc puts it on Marty's head.

Doc: Perfect, you're the spitting image of your future son.

Marty: What?

Doc: Help me move Jennifer over here!

Marty and Doc lift Jennifer out of the DeLorean.

Marty: So what's the deal?

Doc: Grab her feet.

He does, and they put Jennifer down by the discarded laser discs.

Marty: OK, now what?

Doc: In exactly 2 minutes, you go round the corner into the Cafe 80's.

Marty: Cafe 80's?

Doc: One of those nostalgia places, but not done very well. Go in and order a Pepsi. Here's a 50. And wait for a guy named Griff.

Marty: Right, Griff.

Doc: Griff's going to ask you about tonight. Are you in or out? Tell him you are out! Whatever he says, whatever happens, say no, you're not interested.

Marty: OK.

Doc: Then leave, come back here and wait for me. Don't talk to anyone, don't touch anything, don't do anything, don't interact with anyone and try not to look at anything.

Marty: I don't get it, I thought you said this had something to do with my kids?

Doc gets out a newspaper.

Doc: Look what happens to your son!

He gives Marty the paper - USA Today Hill Valley Edition. The headline reads Youth Jailed For Attempted Robbery.

Marty: My son?

Marty looks at the picture.

Marty: God, he looks just like me. (reading from the paper) "Within two hours of his arrest, Martin McFly Junior was tried, convicted and sentenced to fifteen years in the State Penitentiary." (To Doc) Within two hours?