Raj: I'll buy some Bitcoin. I just came into a little extra money when my dad raised my allowance.
Sheldon: You don't have to buy Bitcoin. You can mine it.
Leonard: Mine it? Like, mining gold?
Sheldon: Sort of. There's a limited amount, and we find it not by tunneling into the earth, but by using a computer to solve complex mathematical problems.
Howard: So let me get this straight. We have to write an elaborate program in order to find a fake coin that we can't spend on anything?
Sheldon: Yes.
Howard: That sounds fun.
Raj: Yeah, I'm in.
Leonard: Staying up late, writing code, it sounds like a party.

Leonard: What would you be if you were attached to another object by an inclined plane, wrapped helically around an axis?
Sheldon: Screwed?
Leonard: There you go.

Leonard: Penny, as a scientist, my job is to figure out why things happen. But I don't think I'll ever understand how someone like me could get to be with someone like you. You know maybe I don't need to understand it, I just need to be grateful. I love you, Penny.

Sheldon: This song is never going to stop. Have you ever dealt with something so relentlessly irritating?
Leonard: That's a trick question, right?

Sheldon: Oh, Stuart, good. I was wondering, will you be accepting Bitcoin?
Stuart: Well, I don't know what that is, but it's got "coin" in it, and my cash register doesn't, so yeah.

Mrs. Wolowitz: Howard, what's going on?! Are you boys roughhousing?!
Howard: No, we're not roughhousing! We're scientists! Scientists don't roughhouse!
Mrs. Wolowitz: Excuse me, Mr. Grown-up!

Mrs. Wolowitz: Howard, I made cookies for you and your little friends!
Howard: They're not my little friends, and we don't want cookies!
Leonard: Actually, a cookie sounds good.
Howard: All right, we'll have cookies! Thank you very much!