Adult Sheldon: I eventually made my peace with having a room to myself. And I was never truly alone, thanks to my science posse: Stephen, Albert, Richard and Arthur. But for those times when I did need to communicate with Missy, we had a system.
[Sheldon pulls on a rope which pulls a lever which knocks on Missy's wall, prompting her to pick up a walkie talkie]
Missy: [over radio] What?
Sheldon: Just testing the system.
Missy: You tested it yesterday.
Sheldon: Just because it worked yesterday doesn't mean it's working today.
Missy: It's working. Good night.
Sheldon: Good night. Sleep tight. [knocking on wall]
Missy: [over radio] What?
Sheldon: Did you know when people say "sleep tight," they're referring to when beds were made of ropes, and the tighter the rope, the more comfortable the bed was to sleep on?
Missy: Cool. Bye.
Adult Sheldon: My sister wasn't always a fan of my informative tidbits, so I didn't tell her that the entire phrase, "Good night, sleep tight, don't let the bedbugs bite" is actually from the book What They Say in New England: A Book of Signs, Sayings, and Superstitions. Until I told her. [knocking on wall]

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.

Pastor Jeff: Come on up here, Sheldon. Let's hear what you got.
Sheldon: I've spent the last week studying what people believe, and I've come to a conclusion.
Pastor Jeff: And what's that?
Sheldon: I'm starting my own religion.
Pastor Jeff: I'm sorry, what?
Sheldon: I'm calling it Mathology. It's based on a universal binary system.
Pastor Jeff: That's terrific, Sheldon, but this is a Baptist Sunday school.
Sheldon: I know, I'm here to convert everybody. Any takers?
Pastor Jeff: Okay. Let's go have a talk with your mom.
Sheldon: The only sin in Mathology is being stupid.

Mary: Too bad. We are going.
Sheldon: Class is starting tomorrow. I'm not going anywhere.
Mary: Sheldon, do not argue with me. You are going home.
Sheldon: Mom, the people of Germany are obsessed with rules and devoid of humor. I am home.

Missy: I know what you're doing.
Sheldon: Yes, I'm being thorough about these things so we don't fight about them down the line.
Missy: What you're doing is dragging this out because you don't want me to leave.
Sheldon: No, I'm not.
Missy: Yes, you are.
Sheldon: Do you know the phrase "pish posh"?
Missy: No, and I don't want to.
Sheldon: It's British, and it's used when someone's opinions are absurd. And you're forcing me to use it. Pish posh! Or, more authentically, [English accent] pish posh!
Missy: I'm done. I know what's mine, and I'm taking it.
Adult Sheldon: One day she said the same thing to her first husband. I like to think I prepared her for that moment.

Dale: Uh, okay, just give me a sense of how illegal this is.
Meemaw: Who says it's illegal?
Dale: Well, why is it a secret?
Meemaw: Okay, it's illegal.

Meemaw: So I'm thinking dark red, like a speakeasy. And maybe a little bar in the corner.
Dale: Well, you're gonna need a liquor license.
Meemaw: Oh, right. 'Cause I don't want to break the law in my illegal gambling room.