Principal Petersen: Sorry, Sheldon. Water safety is a required part of your P.E. class.
Sheldon: But other kids use that pool. It's basically a big bowl of teenager soup.
Principal Petersen: It's out of my hands. It's a state requirement. If you don't like it, take it up with your congressman.
Sheldon: I did. He won't return my calls.
Principal Petersen: Then I guess you're swimming tomorrow. [manic laughter, thunder clap and lightning]
Adult Sheldon: Except for the laughter, the glowing eyes and the lightning, that's exactly how it happened.

Adult Sheldon: Observation is an important part of the scientific method. Darwin observed the finches, Jane Goodall observed the chimpanzees, and for some reason, Dr. Sturgis wanted to observe my meemaw's new suitor.

Adult Sheldon: Many inventions changed people's lives for the better: the light bulb, the polio vaccine, and one that doesn't get enough credit, the home video cassette recorder. It didn't help keep people out of wheelchairs, but it did keep me from missing Star Trek.

Missy: Mom, we're going to Chuck E. Cheese!
Mary: We're not going anywhere. It's almost your bedtime. Sorry, hon.
Missy: Well, all that matters is that I'm the winner.
Sheldon: Yes, you are.
Adult Sheldon: Actually, I was the winner. We spent the whole day doing everything I love: drafting contracts, arguing about rules, and most importantly, never leaving the house.

Sheldon: Dad, the university offered to pay for us to go to California! They're even putting us up in a hotel.
George: You're kidding.
Missy: We're going to California?
Sheldon: No, just me and Dad.
Missy: That's fair. I'm so happy for you.
Adult Sheldon: Sometimes sarcasm was laid on so thick even I could detect it.
Sheldon: Thanks!
Adult Sheldon: This was not one of those times.

Adult Sheldon: Later that day, we had a graduation party for me and my sister. I don't normally care for parties, but this one wasn't so bad.
Mary: Who's ready for cake?
Missy: Me!
Dale: Hey, should we say grace?
Mary: Heck, yeah! Let's hold hands.
Meemaw: Oh, cool. Let's say grace.
Adult Sheldon: Dale invited Jesus to the party, and while he wasn't on my guest list, it was okay because it made my mom happy.
Mary: And bless our friends and family...
Adult Sheldon: In fact, it was the best graduation party I had ever been to, until the one we had for my son, Leonard Cooper.
All: Amen.
Missy: Cake!
Adult Sheldon: I wanted his name to be Leonard "Nimoy" Cooper, but Amy wouldn't let me.
Amy: Be happy I let you name him Leonard!
Adult Sheldon: Okay, okay!
Amy: Love you.
Adult Sheldon: Love you, too.

Sheldon: [knocks on door] Missy, I know you're upset. Would you like a hot beverage?
Missy: [o.s.] Go away.
Adult Sheldon: Every culture has their taboos. In the Ukraine, it's rude to whistle indoors, and they're correct. Not a fan. In our society, any discussion of human reproduction seems to be so upsetting, it causes nothing but chaos. Lost jobs. Lost friends. Sleepless nights. Even the word "sex" provokes an uncomfortable reaction. I thought "fornicate" might work, but that seemed too judgy. Then I found the perfect word, a word so bland and clinical that it would be impossible to take offense to it.
Sheldon: "Coitus." That'll work.

Howard Wolowitz: Wait, so after all this time, that's your problem with engineering?
Adult Sheldon: Evidently.
Howard Wolowitz: So all the teasing and all the abuse had nothing to do with me?
Adult Sheldon: I'll admit, at first, I had a chip on my shoulder because of that class, but then it was mostly you.
Howard Wolowitz: Unbelievable. When will I learn?
Adult Sheldon: I could give you that answer, but if you figure it out for yourself, it'll mean so much more.
Howard Wolowitz: Goodbye, Sheldon.
Adult Sheldon: Bye.

Adult Sheldon: [hushed] This is why the only bar I frequent is the Genius Bar at the Apple Store.

Adult Sheldon: Sadly, "niblingo" never quite caught on. But that doesn't stop me from using it in Scrabble.

Adult Sheldon: Every culture has its own traditions to celebrate important life events: bar mitzvahs, quinceañeras, baby's first Comic-Con. My favorites are funeral and baby shower. They're the only two thrown in your honor you're not expected to attend. [whispers] Love it.

Adult Sheldon: Anger is an ugly emotion. Unbridled rage even more so. And when it bubbled up inside me, I channeled it the only way I knew how. I cleaned the house like a man possessed.

Adult Sheldon: As you can see, sometimes a person can be both incredibly intelligent and full of baloney.

Adult Sheldon: What was happening was, like many men before me, I was being seduced by the exotic world of geology.

Adult Sheldon: We searched for tektites in a nearby ravine. Tektites are natural glass formed during meteorite impacts. They also bear a close resemblance to raccoon feces, so I wisely adopted a "no touching tektites" policy.