Beverly Hofstadter: Mary, I'm curious. When did you first realize that your son had such a remarkable mind?
Sheldon: Ooh, good question. Everyone loves stories about Sheldon Cooper, boy genius.

Amy: Do you think the moms will get along?
Leonard: I don't know. They're pretty different.
Sheldon: Maybe they'll be best friends. One of them is brilliant, one is sweet and simple.
*to Leonard*
Sound familiar?

Amy: It's so nice both of your moms are coming in to see you guys get an award.
Sheldon: Well, my mother's been there for every honor I've won since I beat out my twin sister for the Did It on the Potty trophy.

Leonard: So you really think they liked it?
Penny: Oh, sweetie, it was the best speech I--
*Drone comes through the door, knocking Penny and Leonard off their feet*
Sheldon: Don't worry, everyone in here is safe.

Tech Support: Tech Support. Can I help you?
Sheldon: Yes, it's a robot uprising! Call the police!

Howard: What happened to me? When did I become an old man baffled by modern technology? Next thing you know, I'll be hitching my pants up to my armpits and complaining about the awful music the kids are listening to.
Sheldon: It is awful, isn't it? Listen to that noise.

Howard: All right. All systems go. In five...
Boys: ...four, three, two, one.
*An electrical crackle is heard and smoke comes out of the drone*
Sheldon: That's what my train used to do.

Raj: You guys don't have to go to the trouble. I'm back in the money now. I can just buy another helicopter.
Howard: It's not about the money. It's about solving a problem. It's why I became an engineer. It's what I like to do, it's what I'm trained to do. It's who I am.
Sheldon: Oh, look at you, the little engineer that could.

Sheldon: Sorry. Ah, maybe it's for the best. I hear locomotive smoke is the second leading cause of death among train aficionados.
Raj: What's the first one?
Howard: Suicide.
Sheldon: Wrong. Obesity.

Sheldon: You can't return it. Howard wiped his bottom with the warranty.
Raj: What?
Sheldon: I think metaphorically. But he was in the bathroom for a while.

Raj: I have to return the helicopter. My father-- What did you do?!
Sheldon: Don't worry. He went to MIT. He can solve any problem. As long as it doesn't originate in a Russian man's colon.

Sheldon: We did it! Oh! God, if it's this much fun to rotate, imagine when we fly it.

Sheldon: What does red and yellow mean?
Howard: It means the calibration failed. We have to start over.
Sheldon: Oh. Very well. Reinitiating calibration sequence. *flips switch rapidly* One, two, three, four, five, six, seven, eight, nine, ten... *lights on drone don't turn solid yellow* eleven. It's a good thing I didn't send that letter.

Howard: Now I rotate it horizontally on its center axis until the lights turn green.
Sheldon: Initiating rotation sequence. Don't look at me. Initiate.

Howard: Just flip the switch until the lights on the drone change to solid yellow.
Sheldon: All right, that seems simple enough. Initiating calibration sequence. *flips switch rapidly* One, two, three, four, five, six, seven, eight, nine, ten. *lights on drone turn solid yellow* Well, I suppose ten is technically "at least ten." But they're still getting at least one angry letter.