Leonard: Come on. How can you be sad when you're going home with all five foot six of this?
Penny: You think you're five foot six? That's funny.

Leonard: If I take it off, Sheldon wins.
Penny: Sweetie, every night you don't kill him in his sleep, he wins.

Penny: I mean, who even reads Scientific American?
Leonard: It's kind of a big deal.
Penny: If it's such a big deal, how come the biggest celebrity they could get for the cover is a molecule?

Howard: I'm not signing a prenup.
Penny: All right, Howard Wolowitz, listen up! You sign anything she puts in front of you, because you are the luckiest man alive. If you let her go, there is no way you can find anyone else. Speaking on behalf of all women, it is not going to happen, we had a meeting.

Bernadette: Maybe we should get one of those machines to help her up the stairs.
Howard: You mean a fork lift?

Raj: Oh, the movie's not as bad as you thought?
Penny: No, it is. But I decided instead of complaining about it, I'm going to go in every day and give it my all.
Amy: Good for you.
Penny: Thanks. There's no reason why I shouldn't be the best bi-sexual, go-go dancer, slowly transforming into a killer gorilla, anyone's ever seen.

Leonard: Oh, I know. This might help. *Gets a ring out of his wallet*
Penny: Where did you get a ring?
Leonard: I've had it for a couple of years. Not important. Penny, will you marry me?
Penny: Oh, my God, yes.
Leonard: This would have been so much more romantic if you didn't have monkey hair on your finger.