Sheldon: Should I go left or right?
Meemaw: Why don't you try going in that cave?
Sheldon: Why would I do that? It's probably dangerous.
Meemaw: Sheldon, they wouldn't have put the cave there if they didn't want you to go in it.
Sheldon: Seems unnecessarily reckless, but okay. "Dark and dangerous." I told you.
Meemaw: Just keep going.
Sheldon: The box was right, my heart is pounding.

George Sr.: Well, a couple of scientists at the college where Dr. Sturgis teaches are doing a research study on twins. They want to meet you guys, ask you some questions.
Sheldon: Oh, boy, a research study. Will they give us written tests?
George Sr.: Yeah, I think so.
Sheldon: Oh, boy.

Mary: So how's it going?
Sheldon: Well, the principles in the book didn't work for me at all. Although Dad does like being called George over and over again, so you might give that a try.

Mary: Sweet dreams. Love you.
Sheldon: Love you, too, 'cause you're my mom. [LAUGHS NERVOUSLY]

Sheldon: Are we sleeping there? Do I need to bring pajamas?
George Jr.: Just sleep in your underwear.
Sheldon: In my underwear? I hardly think so.

Sheldon: Missy! You gave me your yips.
Missy: What?
Sheldon: I froze on a test. That's never happened before. It's all your fault.
Missy: I told you it's not contagious.
Sheldon: You put the thought in my head. The power of suggestion is very real. Case in point: tulip mania.
Missy: Here we go.
Sheldon: Tulip mania was an insane desire to buy and trade tulip bulbs in the 1600s. It nearly ruined the Dutch economy. You would not believe the gilders they were spending.

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.

George Sr.: Sheldon, I'm talking to you.
Sheldon: Well, I'm not talking to you.
George Sr.: Okay, what's going on?
Sheldon: After having my first good night's sleep in a week, I woke up with a fresh perspective.
George Sr.: And that is?
Sheldon: It was irresponsible of you to burden me with that secret.
George Sr.: Sheldon, we've been through this. It's complicated.
Sheldon: While I may not look up to you from an intellectual standpoint, I've always looked up to you as a role model. I can't do that anymore. And don't worry, we made a deal. I'll continue to keep your secret.

Sheldon: [knocking] Missy?
Missy: What?
Sheldon: Sometimes I imagine that I'm an ion with a positive charge and they're an ion with a negative charge. It's so that whatever they say bounces off me and sticks to them.

Tam: Since when do you drink coffee?
Sheldon: I don't, but this job is killing me. You wouldn't understand.
Tam: You realize I have a job.
Sheldon: At your parents' convenience store? That doesn't count.
Tam: Why not?
Sheldon: You get to sit at a cash register and have the fun of doing math.
Tam: Actually, the cash register tells you how much change to give.
Sheldon: Oh. That's too bad.

Sheldon: I'm ready to go to college.
Mrs. Costello: Okay. Where you thinking?
Sheldon: Somewhere with a good science program, but far enough away to make my mom cry herself to sleep every night that I'm gone.
Mrs. Costello: You're applying to college out of spite?
Sheldon: I see why you're the guidance counselor.

Pastor Jeff: So you were saying?
Sheldon: You've confused possibilities with probabilities. According to your analogy, when I go home I might find a million dollars on my bed or I might not. In what universe is that 50-50?

Ms. Fenley: Do you know this sonata?
Sheldon: No.
Ms. Fenley: How long have you played the piano?
Sheldon: I don't play piano.

Paige: So, did you guys get, like, assigned to look after Sheldon or something?
Darren: No, he ended up in the room next door.
Oscar: So we took him in, like a dog.
Paige: Him being so young isn't, like, weird?
Sheldon: I'm basically 50.
Darren: And we're basically 12, so it all works out.

Dr. Linkletter: What is the angular momentum of the neutron and the proton inside deuterium? [no hands go up] No one? Really? Sheldon?
Sheldon: Yes?
Dr. Linkletter: What is the angular momentum of the neutron and the proton inside deuterium?
Sheldon: Oh, um, "L" equals zero.
Dr. Linkletter: Close. You're missing the four percent admixture of "L" equals two.
Sheldon: Sorry. I'm a little distracted.
Dr. Linkletter: It happens. Anyway...
Sheldon: Normally, I would have gotten that right.
Dr. Linkletter: I have no doubt. Anyway...
Sheldon: There are just some things going on at home, and I'm not allowed to talk about it.
Dr. Linkletter: And we don't want to hear about it.
Sheldon: I can tell you no one's sick in case you're concerned.
Dr. Linkletter: Anyone concerned? Show of hands. [no hands go up] No? Moving on.
Sheldon: That's why I got the answer wrong.
Dr. Linkletter: Son, it's just a mistake. Everyone makes them.
Sheldon: [inner monologue] Like my brother Georgie did when he got that girl pregnant. Don't say it. Don't say it. Don't say it. [Sheldon's hand shoots up]
Dr. Linkletter: What?
Sheldon: I need to use the restroom.
Dr. Linkletter: This is college. Just go. [Sheldon rushes out] You, red shirt. Lock the door.

Missy: What else you bringing her?
Sheldon: Toothbrush, toothpaste, pajamas, and these feminine napkins. Is one box enough?
Missy: Should be plenty.
Sheldon: I hope so. She's been awfully moody.
Missy: Maybe you aren't the best person to be handling this.
Sheldon: Agreed, but I'm all she's got.
Missy: I feel like you should tell Mom.
Sheldon: I promised I wouldn't.
Missy: I know, but this sounds serious.
Sheldon: I got her a toothbrush and lady pads, what more can I do?

Sheldon: Now my mom wants them to get married, but it doesn't sound like the girl's willing.
Dr. Linkletter: Why are you still talking to me?
Sheldon: You and I just click.

Sheldon: Guess what. Dr. Sturgis, Dr. Linkletter and I are starting an Isaac Asimov book club.
Meemaw: That's nice.
Sheldon: I'm glad you think so because you should join.
Meemaw: And I think... no.
Sheldon: But this is perfect for you.
Meemaw: Why?
Sheldon: Because three smart people will be there to explain things that go over your head.
Meemaw: I'm gonna bonk you over your head in a minute.

Sheldon: Sorry again for being distracted earlier.
Dr. Linkletter: And I'm so sorry you got locked out. I don't know how that happened.
Sheldon: My brother got a girl pregnant. My mom wanted me to promise I wouldn't tell, but I never did, so technically, I'm not breaking my word.
Dr. Linkletter: I don't care.
Sheldon: Thank you. But it's a secret, so please don't tell anyone.
Dr. Linkletter: Don't you have somewhere to go?
Sheldon: No.

Missy: What's the problem?
Sheldon: My childhood is ending.
Missy: So?
Sheldon: Look at everyone around us... they're all miserable. Mom and Dad are unemployed. They're constantly fighting. Georgie's having a child.
Missy: First of all, no one's having a kid with you, ever.
Sheldon: Don't be so sure. With this intellect, my genetic material will be a hot commodity. [Missy groans] That's how I feel.