Sheldon: I'll be in my room.
Mary: Oh, come on, Shelly. You still got an honorable mention.
Sheldon: Stop reminding me.

Sheldon: I was sent to see Principal Petersen.
Diane: What is it this time?
Sheldon: Youthful rebellion. My voice hasn't changed yet, but my attitude has.
Diane: I'll let him know you're here.
Sheldon: You do that. Ma'am.

Dr. Goetsch: Now, Sheldon, I understand you've changed your mind about being a scientist.
Sheldon: And you're gonna say I can't?
Dr. Goetsch: No. I think that's great.
Sheldon: You do?
Dr. Goetsch: Yeah. I think it's important to keep your options open. Let me tell you a little story about an extremely smart young boy.
Sheldon: Me?

Adult Sheldon: On any given day, our school gymnasium presented a cocktail of horrors. From daily humiliation to school-sanctioned violence. But one day a year, the gymnasium was transformed into a haven of learning thanks to a remarkable institution known as the science fair. A chance for the student body to come together in the name of research and progress. Uh, while some did the bare minimum, and others preferred razzamatazz over raw data, I set out to save humanity from deadly asteroids.
And made it all neatly fit on three poster boards. The science fair may be a competition, but when the goal is promoting knowledge, we're all winners.

Diane: Sheldon Cooper's outside.
Principal Petersen: Who sent him now?
Diane: Givens.
Principal Petersen: Well, you know what? Givens needs to man up. Cooper's a little boy. It's not hard to handle him.
Diane: I'll send him in.
Principal Petersen: H-Hold on a minute, just Does he know I'm in here?

Principal Petersen: You better run, you little punk!

Mary: Let's talk about something else. Georgie, how was your day?
Georgie: My brother told the entire school we can't afford cable.
Mary: Oh, right. Missy?
Missy: Good, until I learned we can't afford cable.

Mary: Maybe he should talk to somebody.
George: Not it.
Mary: I meant a professional, George.
Meemaw: But way to be a dad.

Dr. Goetsch: For the longest time, I thought I was gonna be a professional figure skater.
Sheldon: And then you became disenchanted with the field like I did?
Dr. Goetsch: Exactly. Someone skated right over my foot. And that was that.
Sheldon: I'm not sure that's the same thing.
Dr. Goetsch: I'd say you lost your passion the way I lost my big toe.
Sheldon: Hmm.

George: Why's he want to study acting?
Mary: The doctor encouraged him to try something different.
Missy: Maybe he'll learn to act normal.
Mary: How about you learn to act nice?
Missy: You people don't appreciate my sense of humor.

Sheldon: Hello. Are you Mr. Lundy?
Mr. Lundy: My father is Mr. Lundy.
Sheldon: Well, then what should I call you?
Mr. Lundy: I guess Mr. Lundy. My father's dead.

[Sheldon performs the splits and Mr. Lundy jumps on to a chair]
Sheldon: That looked dangerous.
Mr. Lundy: No, that looks dangerous.

Meemaw: Now, I was a little unsure at first, but Sandy Duncan does play Peter Pan, so when you think about it-
George: Connie, you're not helping.
Meemaw: Okay.

Mary: We're going to support your brother. Not another word about it.
George: Can we at least sit in the back?
Mary: Not a word.

Adult Sheldon: I'd tell you how an East Texas audience in 1989 responded to a grown man playing Annie, but I think you know.