Leonard Hofstadter: You know I want to marry you, but you're only doing this because you got fired and you're feeling sorry for yourself.
Penny: Okay, it may look that way, but getting fired from that movie was the best thing that could ever happen to me, okay? I finally realize I don't need to be famous or have some big career to be happy.
Leonard Hofstadter: Then what do you need?
Penny: You, you stupid Pop Tart!
Leonard Hofstadter: Oh. Then I guess I'm in.
Penny: Really? You guess you're in?
Leonard Hofstadter: Not like "I guess I'm in:" Like "I guess... I'm IN!"
Penny: Okay. Cool.
Leonard Hofstadter: So is that it? Are we engaged?