Raj: Oh, Daddy, you're so rich and funny.

Raj: Uh, listen, I just wanted to let you know when you get my credit card bill, it might be a little high this month.
Dr. Koothrappali: Well, you're a grown man with a steady job. Why wouldn't you spend all your father's money?

Raj: I can't believe what I'm hearing. This is deeply hurtful.
Dr. Koothrappali: You're also too sensitive. Women don't want that either.

Penny: What is happening?
Leonard: This is an Euler's Disk. It's a physics toy that demonstrates angular momentum, potential energy, and kinetic energy.
Penny: Aw, look at you watching sports.

Penny: Okay, I want in. Ten bucks says I'll lose interest before that thing stops spinning.

Howard: We're betting to see if Koothrappali can hold his breath longer than the disk can spin.
Sheldon: Its weight and smoothness, along with the slight concavity of the mirror, means it can spin for a long time.
Leonard: But Raj is from India, which means he's no slouch at holding his breath.

Leonard: (To Raj) Dig deep! Like when we bet you couldn't fit into Howard's pants!

Amy: Hey, Sheldon, I found a great restaurant for date night.
Sheldon: Kind of busy right now.
Amy: Oh, an Euler's Disk! Fun!
Howard: Yeah, we're seeing if Raj can hold his breath longer than it.
Amy: Oh. Immature.

Leonard: Aren't you gonna look at the board to see how right we are?
Sheldon: No, thanks. I'm busy trying to fix this fuel pump.
Howard: It's a manifold.
Sheldon: Oh. Well, I guess it's fixed.

Leonard: So, what do you say?
Sheldon: Oh, what choice do I have? You need me. (pointing to the engine) I'm like the crankshaft of this team.
Howard: That's a turbo.
Sheldon: Well, whatever it is, it looks heavy. I'm gonna need you two to get it downstairs before Amy comes home.

Leonard: Come on, Sheldon. You can't turn your back on physics. Besides, you have no idea what you're doing with this stuff.
Howard: But if you really want to learn the mechanical side, I can teach you anything you want to know.
Leonard: And instead of standing around watching, you can help us build your smaller guidance system.
Howard: And with all these new skills, you'd be able to fix any model train. You'd be the king of the train store!
Sheldon: Excuse me. I have a girlfriend. I'm already king of the train store.

Leonard: Just look at the board.
Sheldon: That's wrong.
Leonard: Oh, no! What should we have done differently?
Sheldon: Well, first of all, you can't use relativistic and non-relativistic vectors in the same equation.
Howard: Told ya. (scoffs) Can you fix it for us?
Sheldon: (sighs) Okay, but this is the last time. (Draws Charlie Brown's face on the squiggle Leonard drew on the board) Nice try, blockheads.

Bernadette: You think that stuff is fun? Being a parent is terrifying. I'm constantly worried, I'm always tired, and in a few minutes, I'm gonna milk myself in a bookstore parking lot.

Bernadette: You're upset I had a baby?
Penny: No, of course not. I just I didn't think it would make me have all these feelings.
Amy: What feelings?
Penny: Pressure! I mean, she's looking at preschools, she has a minivan, she has a 401(k). Before she talked about it, I just thought that was a race.

Amy: Hey, there's another dance club nearby. I mean, I don't know how you feel about Latin music, but according to their "horas of operacion", they're open.
Penny: Maybe we should just call it a night.
Amy: You sure? They're open till dos.