President Hagemeyer: Well, I hope that you're starting to see the challenge I faced putting any of you in charge.
Sheldon: You're right, we're sorry.
Dr. Linkletter: Stop that.
Sheldon: Sorry.
Dr. John Sturgis: Well, we can't move forward until a project leader is chosen.
Sheldon: He's right, I'll do it.
Dr. Linkletter: You're a child.
Dr. John Sturgis: [to Linkletter] You're a child.
President Hagemeyer: Oh, you're all children.
Sheldon: Sorry. [to Linkletter] Sorry.

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]

Adult Sheldon: Scientific rivalries are a fact of life. When two competing scientists work on a project, it can devolve into an intellectual boxing match. Over the years, there's been a few classic heavyweight bouts. Newton and Leibniz. [bell ringing] Tesla and Edison. And in a lesser-known but equally brutal bout...
[fantasy:]
Announcer: Linkletter versus Sturgis, The Tussle with No Muscle. Let's see how they stack up in a tale of the tape. In the wire frame glasses, the Eureka from Topeka, Grant Linkletter. IQ: 159. Papers published: 272. Bedtime: 8:30. And his opponent, in his favorite sensible shoes, The Brain from Maine, John Burgess Sturgis! IQ: 162. Papers published: 221. Bedtime: 7:45 on weekdays, 9:00 on Saturday night. Fasten your thinking caps and let's get it on.

Dr. Linkletter: I cannot work with that creepy little know-it-all one more day.
President Hagemeyer: I-I'm sorry, but are we talking about Sheldon or Sturgis?
Dr. Linkletter: Sturgis. Well, both, but mostly Sturgis.
[cut to:]
Dr. John Sturgis: He's not interested in anyone else's input.
President Hagemeyer: I-I'm sorry, Sheldon or Linkletter?
Dr. John Sturgis: Linkletter.
President Hagemeyer: Ah, got it. Continue.

Dr. John Sturgis: I was brought in to help but Dr. Linkletter doesn't value my input.
President Hagemeyer: Oh, I hear you. That must be tough.
[cut to:]
Dr. Linkletter: Ever since he was brought back, he contradicts everything I say.
President Hagemeyer: I hear you. That must be tough.
[cut to:]
Sheldon: There was a time when their arguing brought out the best in them, but now it's just hindering our work.
President Hagemeyer: I hear you. That must be tough.