Sheldon: Stop! You're not fighting Tommy, you're fighting me.
Tommy: Oh, boy.
Sheldon: Unless you want to shake hands and we all laugh about this over a glass of milk.
Jason: I think I'd rather kick both your asses.
Sheldon: I was afraid you'd say that. Are you familiar with the story of David and Goliath from the Bible?
Jason: Yeah.
Sheldon: That's too bad. I had a nice speech prepared. I'll say it anyway. You may have the size advantage, but like David and his sling, I also possess an air-based weapon. So I'll give you one more chance. Are you willing to step down?
Jason: I'll tell you what: you take the first shot, then it's my turn.
Sheldon: Very well. Three, two, one.
Jason: Ow! Son of a bitch!
Sheldon: I'm going to run.

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]

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.

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.

Tam: Look at this, my mother left me a note. "You can do better. Mom." Not "Love, Mom," not "XO, Mom," just "Mom."

Sheldon: Good news, I just spoke to Tommy Clarkson.
George Jr.: What? Are you crazy?
Sheldon: Nope, Mom had me tested.

Sheldon: Excuse me, sir. When you're done urinating, I'd like to ask you some questions about social dynamics, intimidation, threats, et cetera. Finish up, no hurry.