Howard: There's got to be other ways you can make a quick buck.
Raj: Yeah, you'd think. (Bernadette enters with shopping) Ooh, maybe I could sell my blood and sperm.
Bernadette: I really should wear a bell around my neck so you guys can hear me coming.

Bernadette: Gosh, Amy. I'm sensing a little hostility. Is it maybe because like Sheldon's work, your sex life is also theoretical?

Bernadette: (Shouting from the bathroom) How many times do I have to tell you to replace the toilet paper when it's empty?
Howard: I'm in the middle of something.
Bernadette: So am I!

Leonard: You don't go into science for the money.
Bernadette: Speak for yourself. Last month my company both invented and cured restless eye syndrome. Ka-ching, ya blinky chumps!

Penny: So, do you want to come?
Amy: No, thanks. I already live in a place all the nerds come to.

Raj: Oh, Double Stuf Oreos, I remember when I could afford you.

Sheldon: He also has a remarkable amount of credit card debt.
Howard: I thought your dad paid your cards.
Raj: I have a card for emergencies that I pay for myself.
Sheldon: What emergency happened at the L.A. Zoo?
Raj: That's a penguin I sponsor. They're losing their homes to global warming, and my car gets, like, seven miles a gallon, so I felt bad.