Evan: That's insane.
Sheldon: Oh, I'm insane? You're the cheating winker. Are you from California?
Evan: Oh, now you want to know where I'm from.
Sheldon: I think I know enough. Goodbye.
Evan: Thanks for cleaning up.
Sheldon: You're welcome. Also, the toilet bowl is still disinfecting, so I wouldn't use it for another 20 to 30 minutes.

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.

Sheldon: Mark my words, string theory is going to be the next big thing.
Mary: What does it do?
Sheldon: It explains the fundamental forces of the universe. How everything works, where everything came from.
Mary: I know where it all came from. [points to the heavens]
Sheldon: Mother, we're in the sky. Why are you pointing up?

Sheldon: [baby crying] Babies. Why'd it have to be babies?
Mary: Oh, relax. He'll cry himself out. You won't even know he's there.
[four hours later:]
Sheldon: [baby crying] [sighs] Please tell that mother to quiet her baby.
Mary: Sometimes moms can't make their kids be quiet no matter how much they try.

[After a bout of turbulence, Mary clasps her hands together in prayer]
Sheldon: Oh, there's no reason to do that. It's just irregular motion of air around the plane caused by temperature changes. [more turbulence] Oh, that was a big one. And given our altitude, perfectly predictable. [cabin alert chimes]
Flight Attendant: [v.o.] The pilot has turned on the seatbelt sign. Please return to your seat.
Sheldon: A reasonable precaution. [checks seatbelt] Snug as a bug. [more turbulence]
Mary: Would you like me to include you in my prayers?
Sheldon: No, thanks, I don't need to seek help from an invisible man.
Mary: You're right, you've got your invisible strings.