Sheldon: Your mother lets you wear lipstick?
Paige: Of course not.
Sheldon: Interesting. Does she know you're leading a double life?
Paige: Grow up.
Sheldon: Why do you think you're rebelling against parental authority?
Paige: Isn't it obvious? I'm having a textbook reaction to their divorce.
Sheldon: What textbook? Did you get it from the library?

Mary: Let's say grace.
Sheldon: Hang on, safety first. [puts mittens on]
George Jr.: When are you gonna get over that?
Sheldon: I would think recent events would make you value protection.
Mary: Enough.

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.

Missy: What's it like to not believe in God?
Sheldon: It's great. Big fan.
Missy: Are you ever afraid you're wrong?
Sheldon: About religion? Never. About other things? Also never.

Missy: Why don't you believe in God? [Sheldon raises his hand] Sheldon.
Sheldon: Because science explains the universe without the need of inventing a supernatural being.
Missy: But how do you know for sure He doesn't exist?
Sheldon: Ooh. [raises hand]
Missy: Stop that.
Sheldon: The burden of proof isn't on me. If I said there was an invisible monkey in the room with us, you shouldn't believe me just because you can't prove me wrong.

Pastor Jeff: Now, for a psalm 100 bookmark, who can name the apostles? [Billy raises his hand] Billy.
Billy Sparks: Sleepy, Grumpy, Doc...
Pastor Jeff: Those are dwarves. Anyone else?

George Sr.: Just go get your money back and buy a different car.
George Jr.: No.
George Sr.: Georgie, I'm not playing around.
George Jr.: Neither am I. I bought it with my own money, and you don't get a say.
George Sr.: As long as you live under my roof, I get plenty of say.
George Jr.: Fine. I'll move out.
George Sr.: And where you gonna go?
George Jr.: I'll live in the van.
George Sr.: [laughs] You know what? It was only a matter of time before you lived in a van. Have at it.
George Jr.: Scooby-Doo lived in a van, and he turned out fine.