Adult Sheldon: I decided to heed my father's advice. I wasn't sure how to turn off my brain. Thankfully, I lived with an expert.
[Sheldon knocks on the garage door. Georgie opens it]
George Jr.: What's up?
[inside:]
George Jr.: I've never really thought about not thinking before.
Sheldon: Well, I'm asking you to think about it.
George Jr.: But I thought you were interested in not thinking.
Sheldon: I am. I want you to think about not thinking, and then teach me how to do it.
George Jr.: Do what?
Sheldon: Not think.
George Jr.: All right. [silence] This is tough. I'm good at not thinking, but I don't think I can teach you how to not think without thinking.
Sheldon: Hmm, well, thank you for trying.

George Jr.: What are you doing?
George Sr.: Separating the whites from the colors.
George Jr.: Whoa, that's racist.

George Jr.: I think the saddest part about it is just how sad it is.

George Jr.: So, Vietnam, like in Rambo.
Tam: Yes.
George Jr.: That's a cool movie.
Tam: Yes.
George Jr.: Are you in it?
Tam: No.

George Sr.: Look. I know you don't respect what I do as a coach.
Sheldon: Maybe you do know me.
George Sr.: But this is a thing I actually know about. I've seen it happen to my players. I've seen it happen to pros in golf. In baseball. The answer is always the same. Stop thinking and get out of your own way.
Sheldon: I don't know how to do that.
George Sr.: Have you ever heard the Nike slogan "Just do it"?
Sheldon: I'm familiar with the phrase "let's do it," uttered by Gary Gilmore, the last person to be executed by firing squad in America.
George Sr.: Okay, well, it's a shoe slogan. And it's good advice. The answer is already in your head. Don't think so hard. Just do it.
Sheldon: I'll try.
George Sr.: Good man.

Adult Sheldon: Of all the tests one takes in school, my favorite was the midterm. Finals weren't bad, but they also meant summer was approaching. I don't believe in religion, but sunshine, picnics and pool parties are proof hell exists.

Sheldon: I can't remember what the zeroes of the Bessel function are.
Dr. Linkletter: You didn't memorize them?
Sheldon: Of course I did... October 7th, 1988. I had just had a bowl of Teddy Grahams.
Dr. Linkletter: Then what's the problem?
Sheldon: I'm blanking, but I'll get it.
Dr. Linkletter: Sorry, son, class is over.
Sheldon: No, I can do this.
Dr. Linkletter: It's just one question. You'll still pass.
Sheldon: Sheldon Cooper doesn't "just pass."
Dr. Linkletter: I have an idea. Let me see the test. [Sheldon hands him the test] Thank you.
Sheldon: Sheldon Cooper isn't always that gullible.
Dr. Linkletter: He was today.