Sheldon: But what if I never figure it out?
Albert Einstein: I never did and my scientific career is nothing to sneeze at.
Richard Feynman: Same here.
Stephen Hawking: Agreed.
Professor Proton: Uh, don't-don't look at me. I-I drive a Yugo.

Sheldon: I also found this letter from Caltech. I wonder why she was hiding it.
Missy: So read it.
Sheldon: I'm not allowed to. It's not addressed to me.
Missy: Who cares?
Sheldon: The U.S. Postal Service is a government agency. Mail is protected by federal law.
Missy: I'll read it.
Sheldon: Don't. If you do, I'll be an accessory to the crime.

Adult Sheldon: I never understood why kids didn't like being sent to the principal's office. I thought it was great.
Principal Petersen: Sheldon, you are a remarkable young man.
Sheldon: Thanks, and you're a remarkable old man.
Mary: Sheldon.
George: So you sure he's got all the credits he needs?
Principal Petersen: Yeah, between his coursework and his AP tests, he's met all of his academic requirements. He even managed to get a good grade in P.E.
Sheldon: I earned extra credit snitching on kids who were smoking behind the equipment shed.
Principal Petersen: I don't have to buy cigarettes for a year.

Principal Petersen: One other bit of business. Since you're graduating early, and you're top of the class, that makes you our valedictorian.
George: Way to go, buddy!
Mary: I'm so proud of you, baby.
Sheldon: You seem surprised.
Mary: Well, it's quite an accomplishment.
Sheldon: Being top of the class in this school? I don't think so.
Principal Petersen: We're really gonna miss you.

Sheldon: I imagine my leaving will be hard for you.
Tam: Oh, yeah, being best friends with a little kid really boosted my game with the ladies.
Sheldon: Makes sense. I'm a conversation starter.

Sheldon: Dad, you need to take me home.
George: Why? What's the matter?
Sheldon: I don't have my safety goggles. Let's go.
George: Sheldon, I'm busy.
Sheldon: You're just watching TV.
George: I'm reviewing game tape.
Sheldon: So you know how it ends. I'll meet you at the car.

Kimberly: Sheldon, tell us what you're gonna miss the most about high school.
Sheldon: Nothing.
Kimberly: Really? Not your teachers, your friends?
Sheldon: I only have one friend. And I don't think he's gonna miss me because he already found other people to have lunch with.
Mary: Oh, I'm sure he'll miss you.
Sheldon: And I said I'm okay with watching Professor Proton at night, but that'll never work. I get overtired... everybody knows that!
George: Maybe we could turn the camera off.
Sheldon: And the other day, I couldn't find my safety goggles and I freaked out in school, and my dad asked is this how I plan on acting when I get to college, and I said no, but it probably is because even though I'm smart, I'm just a little boy!
Kimberly: I think we have enough.
George: Cut.

Sheldon: The train museum's looking for a docent.
Mary: What's a docent?
Sheldon: It's a person in a museum who gives information on the exhibits.
Mary: Do you think they'd let someone your age do that?
Sheldon: Why not? I have a high school diploma.
Mary: True.
Sheldon: I know more about trains than anybody.
Mary: True.
Sheldon: And I have the unique ability to wear people down until I get my way.
Mary: So true.

Sheldon: [on the phone] Hello. I understand you're looking for a docent. I'm 11 years old, but you should know I have a high school diploma and I know more about trains than anybody. You still sound on the fence.
Adult Sheldon: It was time to break out my unique ability.
Sheldon: Let me tell you about every model train I own and what each of them means to me. The first locomotive I ever received...
Adult Sheldon: Wouldn't you know it, 47 short minutes later, I got the job.

Mary: Sheldon, you sure about this?
Sheldon: Yes, leave the crusts on. I'm a docent now.

Lawrence: I like your conductor's uniform.
Sheldon: You know what they say. Dress for the job you want. Do I get an "ask me" button, too?
Lawrence: Well, thank you for asking, and yes, you do. I'll be right back. [exits]
Sheldon: Do you see that bell? That's from Texas and New Orleans locomotive number 701. I'd tell you more, but you haven't contributed the suggested donation.
[Sheldon stares at Meemaw until she puts some money in the donation box]
Sheldon: Number 701 was built in 1930 by the Baldwin Locomotive Works. It was a superheated 44 class GS-1 with ...
Meemaw: I want my money back.
Lawrence: Here you go.
Sheldon: Thank you. [to Meemaw] I know you're supposed to pick me up at 4:00, but I may live here now.
Meemaw: Send me a Christmas card.

Lawrence: Just let me know if you have any questions.
Sheldon: This is a very nice builder's plate. How can you be sure it's not a replica?
Lawrence: Now, that is a great question.
Sheldon: Thank you. I also know the answer. Do you?
Lawrence: Well, there's, uh, rust and soot on the back of it from when it was mounted to the engine's smokebox.
Sheldon: Very good. Ah, the 1947 Santa Fe diesel. I've always loved that paint scheme. I wonder if they had a name for it.
Lawrence: Cat's Whiskers.
Sheldon: Correct.
Lawrence: Ha! Two for two.
Sheldon: Did you know that the word "train" comes from the French verb traîner, which means to draw or drag?
Lawrence: [chuckles] Well, I just learned something.
Sheldon: Well, if you enjoy learning things, then you and I are on the "fast track" to friendship. Speaking of fast tracks, the Japanese bullet train, or Shinkansen...

Sheldon: It's almost opening time. Can I flip the sign?
Lawrence: Have at it.
Sheldon: [pulls out stopwatch] Five, four, three, two, one. [flips sign] We're officially open for business. [Sheldon peeks outside to see nobody waiting for the store] Anticlimactic.

Norman: Excuse me.
Sheldon: Hello. Welcome to the Lone Star Train Museum. I'm Docent Sheldon Cooper. If you have any questions... [taps "Ask Me" badge]
Norman: You know where the bathroom is?
Sheldon: Indeed I do. You'll want to chug along past our authentic Southern Pacific Sunset limited whistle, then keep going past our conductor's uniform, which was worn on the Texas and Pacific Railway. Then you'll come upon...
Norman: Son, I have to take a leak.
Sheldon: It's in the back.
Norman: Thank you.
Sheldon: And our toilets flush, unlike the ones on trains before 1889.

Sheldon: This is a genuine locomotive bell from Texas and New Orleans number 701. Now there's a proper technique to make the purest sound. Most people don't know how to do that. But you're in luck, because I do. [bell ringing]