Leonard: Penny, I think I know what to do. Sheldon, I have some more bad news.
Sheldon: More?
Leonard: I'm afraid so. You know the cashew chicken I get you Monday nights?
Sheldon: Yes. From Szechuan Palace.
Leonard: Szechuan Palace closed two years ago.
Sheldon: What? Where did my cashew chicken come from?
Leonard: Golden Dragon.
Sheldon: No. No, this isn't right. Our food always comes in Szechuan Palace containers.
Leonard: Yeah, well, before they went out of business, I bought 4,000 containers. I keep them in the trunk of my car.

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?

Howard: [looking at his caller ID] Ooh, looks like I'm gonna have sex tonight. [answering phone] Hey, baby...
Penny: His right hand is calling him?

Penny: What are we gonna do?
Leonard: We? No, no, no. You had your chance to be "we" for like a year and a half now. Right now, you are you and you are screwed!

Leslie: Boy, your heart's racing. I must've really gotten you going.
Wolowitz: Well, it's partly you, partly my transient idiopathic arrhythmia.
Leslie: Sexy.