Penny: That top has paid off in free drinks 10 times what I originally paid for it.
Sheldon: Yes, Penny has a lot of money tied up in promiscuity futures.

Penny: At one point, they had me figure out how to get a banana out of a puzzle box.
Leonard: Wait, Sheldon gave me a banana in a box. He was testing me, too.
Penny: Unbelievable.
Leonard: And how could a chimp even solve that? That was impossible.
Penny: Really? You couldn't get it out?

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

Sheldon: Woman, you are playing with forces beyond your ken.
Penny: Yeah, well your Ken can kiss my Barbie.

(Howard has just told Mary about his upcoming trip to the International Space Station.)
Mary Cooper: I bet your mom is really proud of you.
Howard: Nope. She says if I don't back out, she's gonna go on a hunger strike. It'd take years before she'd be in any kind of danger, but still.

Leonard: You're talking like a crazy person.
Mary: Actually, I had him tested as a child. Doctor says he's fine.
Sheldon: Told ya.
Mary Cooper: Although, I do regret not following up with that specialist in Houston.

Mary: Back home, there's a woman works at the Walmart. Tall, tall girl. Woman could hunt geese with a rake.