Dr. Gablehauser: Gentlemen, I'd like you to meet Dennis Kim. Dennis is a highly sought after doctorial candidate and we're hoping to have him do his graduate work here.
Leonard: Graduate work, very impressive.
Dr. Gablehauser: And he's only fifteen years old.
Sheldon: Not bad, I myself started graduate school at fourteen.
Dennis Kim: Well, I lost a year while my family was tunneling out of North Korea.
Leonard: Advantage Kim.

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?

Raj: Can you believe it! He watched me work for 10 minutes and than he tried to build a little piece of software that could replace me.
Leonard: Is that really possible?
Raj: As it turned out, yes.

Sheldon: Engineering. Where the noble semiskilled laborers execute the vision of those who think and dream. Hello, Oompa-Loompas of science.

Leonard: Okay, Sheldon, I understand that youre going through a bit of a career crisis, you're searching for some other area where you can feel valuable and productive but I need to tell you something and I want you to listen carefully.
Sheldon: All right.
Leonard: Go away!