Gary: I believe we have to look to gravity and its magnitude...
Adult Sheldon: I was really doing my best to hold it together.
Gary: ...could be a repulsive force if you just add negative mass.
Adult Sheldon: I smiled and nodded like my meemaw's Houston Oilers bobblehead.
Gary: And I also discovered a way that we could predict the masses of all the known particles using the Egyptian pyramids.
Adult Sheldon: In physics, there's a phenomenon known as supercritical assembly. If you bring enough material together in one place...
Gary: The trick is numerology.
Adult Sheldon: ...in the right configuration, eventually, it will explode.
Gary: This is fun. Not a lot of people I can talk to scientist-to-scientist.
Sheldon: We're not talking scientist-to-scientist. You're not a scientist. You're just a rich man that no one will be honest to because everyone wants your money.
President Hagemeyer: Oh, don't listen to him. I mean, he's just a kid. Why don't you tell me a little more about your pyramid thingy? Huh?

Sheldon: Missy and I broke a lot of rules the other night, and we've received no punishment.
George: [sighs] Buddy, it's been a rough week. We're just glad you're both safe.
Sheldon: But in the absence of a divine being, society's rules are what keeps a person's morality in check.
George: Well, there you go.
Sheldon: No, y-you're not following me. If actions have no repercussions, society breaks down, everything devolves into chaos.
George: You might be overthinking this.
Sheldon: I thought so, too. Then I thought about it, and I'm not.
George: Sheldon, you had one bad night. Just let it go.
Sheldon: But... I did something wrong and I got away with it. That's not okay.
George: Buddy...
Sheldon: Socrates maintained that the man who lies to himself has an enemy living within. He's not even a person. He's just a chaos of selfish desires wrapped in an animal hide.

Sheldon: Unbelievable. It's either cartoons or men in their underwear banging their heads together.
Ricky: You complain a lot.
Sheldon: Excuse me?
Ricky: Seriously, dude, you need to relax.
Sheldon: How can I relax? I'm being held captive in a bacterial playground.

Ms. MacElroy: Now, can anyone tell me why Melville shifts the narrative voice from Ishmael to Ahab? [Ms. MacElroy waits for somebody else to raise their hand] Sheldon.
Sheldon: I have a tummyache. I'd like to see the nurse.
Derek: A "tummyache"?
Sheldon: Yes, Derek, I have a tummy and it aches. Ergo, tummyache.
Derek: Ergo?
Sheldon: It's Latin, Derek.
Ms. MacElroy: Go to the nurse.
Sheldon: And to answer your question, the shifting point of view grants the reader a broader perspective of events than typically allowed by first-person narration.
Ms. MacElroy: Where were we?
Sheldon: And "ergo" is Latin for "hence," Derek.

Georgie: See? They ain't allowed to dance, either.
Missy: It's like I'm watching my life.
Georgie: That's how I feel when I'm watching Top Gun.

George: Come on, Sheldon, think of it as a free dinner.
Sheldon: I'm a kid. All my dinners are free.

Dale: Now, what do you think young people talk about on their dates?
Meemaw: I don't know. But my knee's telling me it's gonna rain this weekend.