Leonard: Okay, that's enough. This fight either has to end or get way more entertaining.

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.

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

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: Can I get you anything else?
Amy: No, thanks. I think I'm good.
Sheldon: You sure? There's still plenty of pork fat. Although, if we don't eat it, I suppose we could turn it into soap.
Amy: That might taste better.

Sheldon: Uh-oh.
Amy: What?
Sheldon: I left the food out.
Amy: You afraid it's gonna go good?

Amy: I know we only have coitus on my birthday, but I don't know if I can wait until midnight.
Sheldon: Oh, well, you'll be glad you did. Everyone knows the best foreplay is rigid adherence to a strict schedule.