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...

Sheldon: Oh dear, Big Bird.

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.

[When President Hagemeyer walks in to her office, she is surprised to see Sheldon seated at her desk facing away from the door. Hagemeyer tries to turn around and walk out]
Sheldon: I smell your perfume.
President Hagemeyer: So, what, pray tell, is today's problem?
Sheldon: I have a four-hour gap in my schedule.
President Hagemeyer: How is that a problem?
Sheldon: According to the Oxford English Dictionary, it's a matter or situation regarded as unwelcome or harmful and needing to be dealt with and overcome.
President Hagemeyer: Fine, go hang out in the cafeteria.
Sheldon: I don't "hang."
President Hagemeyer: Go to the library.
Sheldon: Too noisy.
President Hagemeyer: Take a nap. Kids love those.
Sheldon: In a public place? I'm sorry, is this Woodstock?

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: 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.

Dr. Lee: How can I help you?
Sheldon: I feel like my contributions aren't being taken seriously.
Dr. Lee: Oh, well, I'm sorry you feel that way, but I'm listening to everyone's contributions.
Sheldon: But you're not taking any of mine.
Dr. Lee: No. But Drs. Linkletter and Sturgis seem happy with the direction we're headed.
Sheldon: Well, I think it's because you're using your feminine wiles.
Dr. Lee: And what exactly do you think that means?
Sheldon: I'm not sure, but you are wearing lip gloss and seem to have good hygiene. And if you're trying to use them on me, it's not going to work.
Dr. Lee: Sheldon, I assure you that I'm just trying to do what's best for the project.
Sheldon: Excellent, then you'll want to set up several telescopes in an array.
Dr. Lee: I hear you, but... ghobe'.
Sheldon: Wait, that's "no" in Klingon. Do you speak Klingon?
Dr. Lee: I looked up that one word. I had a feeling it would come in handy. [Sheldon grunts]

Pastor Jeff: Who would like to tell us how God touched their lives this week? [Sheldon raises his hand] Sheldon.
Sheldon: He didn't, because He doesn't exist.
Pastor Jeff: Then why raise your hand?
Sheldon: Not just any hand. My left hand. Because I'm able to overcome any obstacle.
Pastor Jeff: And maybe God helped you do that.
Sheldon: Actually, it was Stephen Hawking, and he's better because he exists.
Pastor Jeff: Yes, 'cause God made him. Anybody else? [Billy raises his hand] Billy.
Billy Sparks: Is this gonna be on the test?
Pastor Jeff: Oh, boy.

Sheldon: I will not be denied my jelly. [lid pops] Yes! Watch out, peanut butter. You're next.

Adult Sheldon: The next day I returned to my role as lab assistant with renewed vigor. Bolts were greased, wires were stripped, floors were swept, all with a smile. It was a forced smile but you'd never know.
Dr. Linkletter: I must say, Sheldon, I'm impressed.
Sheldon: I gave you my word and I'm standing by it.
Dr. Linkletter: Well, I know it's not glamorous, but all scientists pay their dues.
Sheldon: And I'm happy to do it.
Dr. Linkletter: Good man.
Sheldon: I understand my role here. In fact, I noticed a flaw in your reaction rates, but I kept it to myself because I know my place.
Dr. Linkletter: You really think there's a flaw?
Sheldon: Oh, yes.
Dr. Linkletter: What is it?
Sheldon: I appreciate you testing me, but I'm not going to crack.
Dr. Linkletter: I'm not testing you.
Sheldon: Nice try.

Mary: What I meant was... maybe it's time to take a break from your college classes.
Sheldon: What? Why? I've gotten straight As.
Mary: I know you're smart enough for college. I'm just not sure you're mature enough.
Sheldon: Well, it appears you've backed me into a corner. I would throw a tantrum right now, but that would just prove your point.
Mary: Where are you going?
Sheldon: To play with my trains. Which may sound immature, but it's a hobby many old men enjoy.

Dr. Linkletter: [on the phone] Look, I haven't done a forensic examination of this paper, but it's not uncommon to show your work to a colleague to get their feedback.
Sheldon: But I fixed his paper.
Dr. Linkletter: This kind of accusation could have real consequences. I'd consider my next steps very carefully.
Sheldon: You're no help. Put me through to your supervisor.
Dr. Linkletter: Please let me speak to John before you take this any further.
Sheldon: All right, but if he calls me a baby, feel free to say, "Then I guess you needed a baby to fix your paper."
Dr. Linkletter: That's a good one, but I'm not gonna say it.

Sheldon: And then he ripped up my paper right in front of me.
Mary: What is this man's problem?
Sheldon: I don't know. He didn't even use a ruler. He just ripped it up, willy-nilly.
Mary: Do you want me to call the school?
Sheldon: No, he was in the Army. I want him to think I'm tough.
Mary: Sure. Well, I'm sorry you had a bad day. How about a little trip to RadioShack?
Sheldon: RadioShack's not gonna make this better. It's also not gonna make it worse, so okay.
Mary: You got it.
Sheldon: Maybe he was just intimidated by my intelligence.
Mary: Or maybe he's an insecure bully taking out his frustrations on a little boy.
Sheldon: I like my version better where I'm intimidating and not a helpless child.
Mary: Okay, he's taking out his frustrations on a powerful and intimidating young man.
Sheldon: That works.

President Hagemeyer: Well, I hope that you're starting to see the challenge I faced putting any of you in charge.
Sheldon: You're right, we're sorry.
Dr. Linkletter: Stop that.
Sheldon: Sorry.
Dr. John Sturgis: Well, we can't move forward until a project leader is chosen.
Sheldon: He's right, I'll do it.
Dr. Linkletter: You're a child.
Dr. John Sturgis: [to Linkletter] You're a child.
President Hagemeyer: Oh, you're all children.
Sheldon: Sorry. [to Linkletter] Sorry.

Missy: I'm liking my crock monster.
Dr. John Sturgis: Mmm. Me, too.
Sheldon: I can't taste anything after the lemon water.

Sheldon: I finished my design assignment early.
Professor Boucher: I admire that initiative.
Sheldon: Thank you, I stayed up late to finish it. My normal bedtime is 2100 hours, but I was so excited to do it that I took a power nap in my Meemaw's back seat on the drive home. [slides document towards Boucher]
Professor Boucher: Uh, you'll need to do this again. It's wrong. [slides it back to Sheldon]
Sheldon: No, it's not. [slides it back to Boucher]
Professor Boucher: Son, I'm giving you another chance before it's due.
Sheldon: Well, what's wrong with it?
Professor Boucher: That's your job to figure out.
Sheldon: I would argue that it's your job to teach me. [slides it back to Boucher]
Professor Boucher: Let's see. [clears throat] To start, this bridge is in pieces.
Sheldon: What do you mean? [Boucher rips the document in two] Well, two can play at this game.
[Sheldon rips the document in two] [Boucher places the pieces in the trash can] Well, now they can't.

Dr. Lee: I suggest we mount a radio telescope on the roof so that we can get a good read on the fluctuations in radiation.
Dr. Linkletter: Excellent. We'll pick a small region of the sky and drill down.
Dr. John Sturgis: Whoa, whoa, pump your brakes. We need at least a 45-square-degree sector of the sky in order to take any meaningful readings.
Sheldon: That's ridiculous. What we need to do is cut a single linear section across the horizon.
Dr. Linkletter: No, if we don't focus, we won't get any useful data. I suggest 20 arc minutes max. The trick is to pick a good spot.
Dr. John Sturgis: You want a trick? Go see David Copperfield.
Dr. Linkletter: How about I make you disappear?
Dr. Lee: [claps] Do I need to separate you? Or can we try to put our minds together for the advancement of science?
Dr. Linkletter: The second one.
Sheldon: I know you're new here, ma'am, but this is our process. They argue, I swoop in and save the day. It may seem unorthodox to you, however... [Dr. Lee claps again] The- The second one.

Missy: You're so weird.
Sheldon: More than usual?
Missy: No, I guess not.
Sheldon: Perfect.

Adult Sheldon: To avoid looking suspicious, I tried to interact with my mom as little as possible. Thankfully, it's rude to speak with your mouth full.
Mary: You look tired, baby. Sleep okay?
Sheldon: [shoveling food into his mouth] Mm-hmm.
Mary: So how big a tax refund you think we're gonna get?
Sheldon: [pointing at his mouth] Mm.