Dr. Linkletter: How about this? Here's the key. Go nuts.
Sheldon: But I'm a minor. I require adult supervision.
Dr. Linkletter: I won't tell anyone.
Sheldon: I will. I'm quite the tattler.
Dr. Linkletter: Then you'll have to wait till Monday.

Sheldon: When you are ready to laugh, I have got the movie for you. Bingo. It's for men, but I think you'll get it.

Sheldon: Hello.
George Jr.: Sheldon, this is Mandy's brother, Connor.
Sheldon: Are you watching the game? Because I heard the Cowboys are going to go all the way this year.
George Jr.: It's okay. He don't watch football either.
Sheldon: Great. I learned who Troy Aikman is for nothing.

Connor: Look how gritty this is. Frank Miller really brought a whole new aesthetic to comic books.
Sheldon: Hmm. I've never really thought of it that way.
Adult Sheldon: I was doing it. I was bonding.
Sheldon: Now, would you please put it back in the bag?
Connor: Oh. Sure.
Adult Sheldon: And I was great at it.

Sheldon: I'm sorry, Pete. You were saying?
Pete: Any chance your bread was past the expiration date?
Sheldon: No, it was brand-new. But I did a taste comparison after it was bought out by the Domestic Food Corporation, and they are definitely not the same.
Pete: Well, I can assure you that, "the recent acquisition by the Domestic Food Corporation has not affected the quality of our products in any way. Every single bread, baked good, and pastry is made with love. From our hearth to your home."
Sheldon: Then why does it taste different, Pete? Why?
Pete: Well, because now we make everything really cheap and fast. Bye.

Sheldon: Dad, would you care for a piece of gum?
George Sr.: No, thank you.
Sheldon: Please, take a piece of gum.
George Sr.: Why?
Sheldon: Just please. Bazinga.

Adult Sheldon: Once I was on the lookout for liars, I saw them everywhere.
William Shatner: [on TV] ...absolutely necessary.
Sheldon: You're not a captain. You're just an actor. Which is another word for liar.
William Shatner: [on TV] And nothing... is more important than my ship.
Sheldon: He's so darn good at it, though.

Sheldon: Starting today, I'm done helping the football team.
Tam: But if you do that, girls will no longer greet me like this. [head
Sheldon: I'll greet you like that.
Tam: It's not the same.

Dr. Hodges: Anything else?
Sheldon: Yes. I'd like a glass of water. It's time to take my Zantac.

George Jr.: This is really good, Meemaw.
Meemaw: Really good? You're spitting the best brisket in Texas all over the damn table.
Mary: Close your mouth when you eat.
Sheldon: Or aim your face the other way.

Sheldon: Oh dear, Big Bird.

George Sr.: Y-Your mom's at church. W-What do you want for dinner?
Sheldon: I believe you know what I want for dinner.
George Sr.: Is that right?
Sheldon: It's Thursday. What does Mom always make me on Thursdays?
George Sr.: Spaghetti and hot dogs?
Sheldon: [to the camera] Socrates. Got to love him.

Mary: Sheldon, I didn't change anything. Can I get back to work now?
Sheldon: I suppose so.
Mary: Thank you. Bye.
Sheldon: Don't I get an "I love you"?
Mary: I love you.
Sheldon: One more time, with a little more energy. [dial tone] Must've been disconnected.

Sheldon: Wednesday morning, the Nobel Prize winners are going to be announced in Sweden, and we'll hear it as it's happening.
Dr. John Sturgis: Well, 2.8 milliseconds later.
Sheldon: Sure, because of the propagation.

Dr. John Sturgis: But we haven't cut open the pineapple yet.
Mary: You boys go ahead. We'll eat the pineapple another time.
Sheldon: But we haven't had a chance to talk about science.
George Sr.: Ooh, can Sheldon come?
Sheldon: Can I?
Mary: No.
Sheldon & John: Aw.

Meemaw: All right, Moon Pie. I'll see you after class.
Sheldon: Aren't you going to walk me in?
Meemaw: I think you can manage it.
Sheldon: Is it because you're trying to avoid Dr. Sturgis?
Meemaw: No.
Sheldon: Is it because you're getting old, and you're trying to limit the number of steps you take?
Meemaw: Get in there.

George Sr.: If you want to see Stephen Hawking, we have to sit down right now.
Sheldon: It's too dangerous. I can't!
George Sr.: It's okay to be scared. Th- That's when you got to dig deep and be brave. So, what do you say?
Sheldon: No, I'm your terrified little boy!

Sheldon: Why did your mom make you?
Paige: Punishment. I got caught with cigarettes.
Sheldon: Why would you want to smoke?
Paige: To look older.
Sheldon: My meemaw smokes. I guess it works.

Sheldon: One interpretation would be, if I was standing at the event horizon, I could interact with my own twin.
Missy: I've interacted with you. It's not great.
Sheldon: I think if there were two of me, we'd be unstoppable.
[fantasy:]
Sheldon #1: So, if we add the information entropy, we'll get the result we're looking for.
Sheldon #2: That's brilliant.
Sheldon #1: I had a feeling you'd like it.
Sheldon #2: That's what the back of my head looks like. Nice.
Sheldon #1: Hmm. We'll call it the Cooper-Cooper Theorem.
Sheldon #2: Perfect. Wait, which Cooper comes first?
Sheldon #1: This Cooper.
Sheldon #2: Why you?
Sheldon #1: I'm the original. You're just my twin.
Sheldon #2: Don't say it like you're better than me. We're exactly the same.
Sheldon #1: I don't appreciate your condescending tone.
Sheldon #2: It's your tone. We're the same person.
Sheldon #1: If we're the same person, why are you so annoying?
Sheldon #2: Stop it.
Sheldon #1: You stop it.
Sheldon #2: What are you gonna do about it?
Sheldon #1: I don't know, I've never been in a fight before.
Sheldon #2: Well, you're about to be.
[reality:]
Sheldon: This is ridiculous. Are you done?
Missy: Not even close. Then Sheldon One grabs Sheldon Two...

[After Dr. Linkletter climbs into his car, Sheldon sits up in the back seat]
Sheldon: I need your help.
Dr. Linkletter: [gasps] Why are you in my car?
Sheldon: Well, I was waiting outside, but then an angry squirrel forced me to seek shelter.