Sheldon: I know Meemaw's brisket recipe.
George Sr.: What?
Meemaw: No, you don't.
Sheldon: Yes, I do. And in order to bring peace to this family, I'm prepared to make it public.
Meemaw: You're bluffing.
Sheldon: One tablespoon of cumin, one cup of brown sugar, two tablespoons of smoked paprika-
Meemaw: Okay, okay, stop.

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]

Sheldon: Missy and I broke a lot of rules the other night, and we've received no punishment.
George Sr.: [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 Sr.: 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 Sr.: You might be overthinking this.
Sheldon: I thought so, too. Then I thought about it, and I'm not.
George Sr.: 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 Sr.: 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.

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.

George Jr.: And I wasn't eavesdropping.
George Sr.: Don't worry about it.
George Jr.: I just don't see why I got grounded.
George Sr.: What are you complaining about? You didn't want to go to church picnic anyway.
George Jr.: I like complaining. I'm good at it.

Adult Sheldon: The average American consumes 55 pounds of beef per year. And then there's Texas, where we can knock that off in a couple of months. Maybe faster, if we're talking about smoked brisket curiously, the one cut of beef that Texans and Jews agree upon.

George Sr.: I'll be right back.
George Jr.: Mind if I have a sip of your beer?
George Sr.: You mind if I dip your head in the compost heap?
George Jr.: You could have just said no.