Bernadette Rostenkowski-Wolowitz: We realized that it's a gift, in the sense that we didn't ask for it, and we may not have chosen it...
Howard Wolowitz: And we already have one.
Penny Hofstadter: You know, whenever I find a top I like, I always go back and get a second one in a different color. (pause) Which I hope is not the case with your baby.
Sheldon Cooper: Let me give you a better question. Here, um, "Dr. Cooper, I heard you were working on a top-secret project for the U.S. military. Why don't you tell us about that?" See, that's a great question.
Amy's colleague: Okay, what was that like?
Sheldon Cooper: Oh, I can't tell you that, it's top-secret.
Rajesh Koothrappali: Why am I buying them a gift? They have love. Screw them and their happiness. What do you have for someone who's bitter and alone?
Stuart: Literally everything.
Mary Cooper (reacting to Sheldon getting engaged): Lord, thank you. Even though you can do anything, that was MIGHTY impressive.