Sheldon: Oh, I'm not nervous, I'm excited. There's a celebrity on the plane.
Mary: Really? Who?
Sheldon: Dr. Van Doornewaard.
Mary: Oh. Who is that?
Sheldon: You're kidding, right? He's the Dmitri Mendeleev of physics.
Mary: And he is...
Sheldon: Dmitri Mendeleev? Oh, he is to chemistry what Pierre-Simon Laplace is to...
Mary: Got it. He's a famous science guy.
Sheldon: Mm. Look at him, sitting in coach like a regular joe. I'm going to go introduce myself.
Mary: Uh, the seatbelt sign is on. I think we're getting ready to take off. [Sheldon grumbles] It's okay. He's not going anywhere.
Sheldon: Ooh, I'm going to have him autograph my vomit bag. I hope I don't have to use it first.

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.

Missy: One question.
George: Yes?
Missy: What's 0600?

Mary: And please look after Sheldon and I as we travel to Germany.
Sheldon: "Sheldon and me".
Mary: [sighs] God doesn't care about grammar.
Sheldon: You're not gonna be on a ten-hour flight with God.
Georgie: I bet it's gonna feel longer than ten.

Sheldon: When we get there, you'll be looking for "international departures".
George: Ah, well, thanks for letting me know that Germany's in a different country.
Sheldon: Is he joking? I'd like to believe he's joking.
Mary: He's joking, Sheldon.
Sheldon: He's a football coach. I don't know what he knows.