Sheldon: I finished my design assignment early.
Professor Boucher: I admire that initiative.
Sheldon: Thank you, I stayed up late to finish it. My normal bedtime is 2100 hours, but I was so excited to do it that I took a power nap in my Meemaw's back seat on the drive home. [slides document towards Boucher]
Professor Boucher: Uh, you'll need to do this again. It's wrong. [slides it back to Sheldon]
Sheldon: No, it's not. [slides it back to Boucher]
Professor Boucher: Son, I'm giving you another chance before it's due.
Sheldon: Well, what's wrong with it?
Professor Boucher: That's your job to figure out.
Sheldon: I would argue that it's your job to teach me. [slides it back to Boucher]
Professor Boucher: Let's see. [clears throat] To start, this bridge is in pieces.
Sheldon: What do you mean? [Boucher rips the document in two] Well, two can play at this game.
[Sheldon rips the document in two] [Boucher places the pieces in the trash can] Well, now they can't.

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]

Mary: Sheldon, faith means believing in something you can't know for sure is real. And right now, I am struggling with that.
Sheldon: So you don't believe in God anymore?
Mary: That isn't something for you to worry about. I need to figure this out myself.
Sheldon: Can I help? Maybe I could provide a fresh perspective.
Mary: I don't think so, baby.
Sheldon: Did you know that if gravity were slightly more powerful, the universe would collapse into a ball?
Mary: I did not.
Sheldon: Also, if gravity were slightly less powerful, the universe would fly apart and there would be no stars or planets.
Mary: Where you going with this, Sheldon?
Sheldon: It's just that gravity is precisely as strong as it needs to be. And if the ratio of the electromagnetic force to the strong force wasn't one percent, life wouldn't exist. What are the odds that would happen all by itself?
Mary: Why are you trying to convince me to believe in God? You don't believe in God.
Sheldon: I don't, but the precision of the universe at least makes it logical to conclude there's a creator.
Mary: Baby, I appreciate what you're trying to do, but logic is here. And my problem is here.
Sheldon: Well, there are 5 billion people on this planet and you're the perfect mom for me. What are the odds of that?

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 Sr.: What are you doing?
Missy: Watching Sheldon struggle with homework. It's so great.

Adult Sheldon: Engineering has a rich and storied history, dating back to ancient times. Some consider it the single most important field of study... Okay, w-wha... no. Stop. I'm sorry. Howard, I can't do this.
Howard Wolowitz: You asked me to write you an introduction to engineering.
Adult Sheldon: Yes, and if I wanted a comedy routine, I'd have gone to Billy Crystal.
Howard Wolowitz: Just let me read it. [clears throat] Engineering has a rich and storied history dating back to ancient times. Some consider it the single most important field of study known to man, from the wheel to the International Space Station, which I went to.
Adult Sheldon: Honestly, this again?
Howard Wolowitz: Like we don't hear about your Nobel Prize all the time.
Adult Sheldon: It's not my fault people ask about it.
Howard Wolowitz: Because you're always wearing it! You have it on right now.
Adult Sheldon: Look how shiny it is.
Howard Wolowitz: [sighs] Just tell your story.

June: I got to admit, I'm a little jealous.
Meemaw: Of what?
June: You.
Meemaw: Why?
June: You have the Dale I never got. I spent a lot of time polishing that turd, and you get all the benefits.
Meemaw: Hey, I put my time in on that, too.
June: Not as much as me.
Meemaw: When I met him, he was a mess.
June: [laughs] You should've seen where I started.
Meemaw: Well, I think we can both agree, he is one lucky turd.
June: Amen, sister.