Sheldon: I believe the condensation on your frozen foods weakened the structural integrity of the bag. But returning to your key conundrum, perhaps you should call a locksmith and have him open the door for you.
Penny: I did, and he said he'll get here when he gets here.
Sheldon: And you're frustrated because he phrased his reply in the form of a meaningless tautology?
Penny: No! I am frustrated because I am a failure at everything and my breath smells like fly.

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

Raj: [to Amy] If you were having Sheldon's baby, would you really want him in the room?
Penny: Yeah, if he's in the room when they're making the baby, I'll give you $10.

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?

Raj: What's with him?
Leonard: Penny is keeping him up at night.
Howard: Me too. But probably in a different way.

Sheldon: Level 3 and she thinks she's rich. What a noob!

Leslie: Hello men. Sheldon.