Leonard: Wow! An appearance by George Lucas's ... dermatologist. Oh, I want that autograph.
Penny: Oh, yeah.

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.

Stuart: I also love how you never use swear words.
Sheldon: You know, it turns out, you can hurt people just as well without 'em.

Sheldon: Stuart, wait. I do know what it feels like to be left out.
Bert: I know how it feels, too.
Sheldon: All right, this is about me and him; you're not part of it.

Sheldon: So until Amy's apartment is fixed, she and I are living here together.
Bert: I lived with my old girlfriend. She was a geologist, too.
Amy: Things didn't work out?
Bert: I came home from work one day and she had taken everything. I'm warning you, hide your good rocks.