Sheldon: Paige, you're supposed to be doing science with me.
Paige: That's boring. I want to do something dangerous.
Sheldon: This is dangerous. We don't have an eye wash station.

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.

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.

Principal Petersen: Our next young speaker needs no introduction, but that didn't stop him from writing one and making me read it. [laughter] "Fun fact." [audience groans, murmurs] I hear you. "The word 'valedictorian' is from the Latin 'valedicere,' meaning 'to say farewell.' It is primarily used in the United States, Canada, the Philippines and Armenia." Maybe that fact's more fun in Armenia. Please welcome your valedictorian, Sheldon Cooper.
Mary: Yay, Shelly!
Sheldon: Hello. I'm not very comfortable speaking in front of crowds. But there's a technique to reduce stage fright by focusing on one person in the audience and delivering your speech just to them. That's what I'll be doing today. If it weren't for this person, I wouldn't be here right now. They've taught me a lot, and it's by their example that I found the courage to move forward into this new and exciting chapter of my life. Missy... ...this is for you. Change can be scary, but I know we're going to be fine... ...because like you said, "It's okay to be scared. We just have to do it anyway." So if any of my fellow graduates are nervous about the future, know that you're not alone. I suggest you all try to be as brave as my twin sister. That's my plan. Missy, I wish I could give you advice about middle school, but I was so smart, I skipped it. If you make it to high school, we'll talk. Thank you. [applause]

Paige: You're being weird, and not in the usual way. Guess that's my life now.
Sheldon: What do you mean?
Paige: Everyone is acting weird. My mom is going on dates and my dad is acting like a child. My sister's crying all the time. I just wish that everything could go back to the way it was. I don't think it will.
Adult Sheldon: It turned out I was really good at listening. The trick is to sit there, and when you want to leave, don't.
Paige: I have to live in two separate houses. And my grandma says the meanest things about my dad. I know that everyone is upset that I'm not doing well in school. It's just hard to care. Everything that used to seem important to me just doesn't anymore. So I guess, really, I just feel alone.
Sheldon: That sounds hard.
Paige: Yeah, it is.

Sheldon: This isn't the Hello Kitty store.
Paige: No. It's Hot Topic.
Sheldon: What's the topic, devil worship?
Missy: Hey, did you know there's a bow tie section in the back?
Sheldon: Why would they hide that in the back? [exits]

Paige: Why are you taking a backpack to the mall?
Sheldon: This is my mall safety kit. Earplugs to drown out crowd noise, Wet-Naps to wipe down escalator handrails, a compass, a map of the mall, and a whistle, in case I get lost or approached by a woman holding a perfume bottle.
Missy: You want to stuff him in there, right?
Paige: No. [nods]