- Homer 'Doc' Brown: A pair of self-centered people like us should avoid children as if they were germs.
- Homer 'Doc' Brown: You know, I disliked children all my life. Little monsters - most of them.
- David: It's grownups make 'em that way.
- Homer 'Doc' Brown: Well, I don't know whether I like you very much either. You're about the strangest young fellow I ever met.
- David: Yes, sir. But aren't you a very strange gentleman?
- Homer 'Doc' Brown: Well... that's tit for tat.
- Homer 'Doc' Brown: Well, bless my soul. Why you're not a boy at all. You're a philosopher.
- David: Am I?
- Homer 'Doc' Brown: Well, of course you are. You see things clearly; you answer questions truthfully. Well, you'd be amazed how few grownups can do the same.
- Homer 'Doc' Brown: Hmmm. You never laugh at any of my jokes. Don't you like 'em?
- David: Oh, yes sir. I like jokes.
- Homer 'Doc' Brown: Hmmm.
- Homer 'Doc' Brown: I've found a most amazing young man. And I've decided to become a father. Uh, you better set another plate.
- Homer 'Doc' Brown: I struck gold - my brother, Ben, and I. And I count that the unluckiest day of my life.
- David: Why?
- Homer 'Doc' Brown: Because money is filthy stuff. I despise it. It corrupts - eats out your heart. It separates brother from brother.
- David: You mean you'd rather be poor?
- Homer 'Doc' Brown: Well, let's say that I, uh, I enjoy my present modest income. I'm free from all the worry that money brings. I have good food, good air, the meadows to walk in. Could I ask for more?
- David: Won't you ever go back?
- [to San Francisco]
- Homer 'Doc' Brown: Never! The city is a wicked place.
- Homer 'Doc' Brown: And, David, if you ever see me buy a ticket to San Francisco, don't hesitate. Burn the stagecoach! Wreck the train! Anything were better than for me to reach the city alive. Can you remember that?