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: 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.

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: My point is, while you're spending all this time on your own, building computers or practicing your cello, what you're really doing is becoming interesting. When people finally do notice you, they're gonna find someone a lot cooler than they thought. And for those of you that were popular in high school, it's over, sorry. Thank you. Congratulations.

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!