Adult Sheldon: I started to think that Paige and I might have more in common than I thought.
Maybe my mother was right. I really did just need to get to know her better.
Paige: Checkmate! You lose. [CHUCKLES] Guess that makes me the smartest.
Adult Sheldon: I don't know if ten-year-old Spock ever flipped a chess board, but ten-year-old Sheldon sure did.

Adult Sheldon: If my mother's faith was the Starship Enterprise, over the next week, she achieved warp factor 9.

Mary: Thank you, Lord, for this little boy.
Sheldon: I knew I could fix it.
Mary: [LAUGHS] Maybe it was you and the Lord.
Adult Sheldon: I don't like sharing credit, but I knew in that moment it wasn't the appropriate time to say it.

Adult Sheldon: The bond between twins is an incredibly close one, which is why I moved 1,500 miles to California the first chance I got.

All: Trick or treat.
Judy: Aren't y'all precious. And you look like a little Carl Sagan.
Adult Sheldon: Vindication, the sweetest candy of all.

Adult Sheldon: : As we sat in silence, I had a horrible realization. For the first time in my life, I didn't look forward to doing my homework.

Sheldon: So one-fourth of the 12 pieces of pie is?
Missy: Three?
Sheldon: Yes. And one-third of the 12 pieces is?
Missy: Four?
Sheldon: Yes. Now how much is one-third of the pie plus one-fourth of the pie?
Missy: Well, three plus four is seven, but there's 12 pieces, so seven-twelve-iths.
Sheldon: It's twelfths. And yes.
Missy: I did it.
Adult Sheldon: Actually, I did it. In less than ten minutes, I taught fractions to a monkey.

Adult Sheldon: In that moment, I was in too much pain to tell my father, "I told you so." But for years after, I reminded him constantly.

George Sr.: Okay, here we go, Sheldon. One "precision astronomical refractor telescope."
Sheldon: Wow. Thanks, Dad.
Adult Sheldon: For the next few weeks, my guilt-ridden father continued to lavish me with gifts. Then the football playoffs started and that was that.

Adult Sheldon: News of my friendship with Tommy had apparently spread.
So much so, the student body was finally treating me with the respect I deserved, even when Tommy wasn't around. This must be how Carl Sagan felt, walking through the halls of PBS.

Adult Sheldon: Like Superman in a phone booth, I was no stranger to undressing in my gym locker. But not today. Thanks to Tommy, I was invincible.

Adult Sheldon: Conventional wisdom tells us that when one stands up to a bully, the bully will inevitably back down and respect you for your courage. My experience suggests otherwise. When Jason finally caught me, he had the good sense not to commit assault and battery.
This did not, however, prevent him from imprisoning me in his locker.
That was a very long night. Very long.

Adult Sheldon: It should come as no surprise that the very first grade I ever received was a "super-duper." Granted it was for counting spots on a ladybug, but still, I nailed it. Even as the difficulty of assignments grew, I maintained the same level of excellence. In every class, in every subject, I was perfect. Which is why this day hit me like a ton of bricks.

Adult Sheldon: Once again, I brought my mother so much joy she was moved to tears. I don't know how I do it.

Adult Sheldon: A few times a year, there was a dedicated day where my school was closed.
This allowed the teachers to catch up on their administrative duties. While I was normally against a break from learning, I did applaud the Medford faculty's commitment to our education.

Adult Sheldon: Teachers have always been impressed by me. And my new college professor was no exception. You'd think it was my once-in-a-generation intellect. But it was more than that. There was my wicked sense of humor.
Dr. Linkletter: ...explained by maximizing entropy. Yes, Sheldon?
Sheldon: Entropy. It isn't what it used to be.
Adult Sheldon: Plus, when things got heavy, I was always ready with a fun fact to lighten the mood.
Sheldon: Fun fact: Did you know that the ancient incas stored bureaucratic records on knotted strings called "quipu"? Q-U-I-P-U. Quipu.
Adult Sheldon: Whatever the reason, I was clearly his favorite student.
Dr. Linkletter: Connie, what a treat it is to see you.
Adult Sheldon: Look at him smile. He couldn't get enough of me.

Adult Sheldon: You never know where scientific inspiration will strike. For Newton, it was under an apple tree. For Archimedes, it was sitting in a bathtub. For me, on this particular day, it had a "sweaty people eating meat" kind of vibe.

Sheldon: Ooh, the long-awaited rebuttal. "While I still believe my theory has merit, I will concede that your point has some validity." My point has some validity. My point has some validity! Yes!
Adult Sheldon: That day, both my sister and I emerged victorious from savage battles. Hers fought with fists, mine with words.
Sheldon: What does my point have? Some validity!
Adult Sheldon: Although we were both pretty sore the next day.

George Sr.: What you doing?
Sheldon: Paige is feeling sad, so I'm making her a hot beverage.
George Sr.: Oh. You're a good kid. I'm proud of you.
Sheldon: Thank you.
Adult Sheldon: Of all my accomplishments, I don't know why he singled this moment out, but I'm glad he did.

Adult Sheldon: The Clean Air Act required all new cars to be equipped with catalytic converters to combat air pollution. The first state to do this was California, which led Texans to say things like-
Peg: I hate California.
Adult Sheldon: And...
Peg: When will that place fall in the ocean? [hacks]
Adult Sheldon: While not everyone was happy about it, six years later, one particular Texan saw an opportunity to get rich quick.
George Jr.: Oh, man, I'm gonna get rich quick.