Leonard: Am I allowed to ask how the class is going?
Penny: It's really good. We've been talking about the origins of slavery. Turn in my first paper tomorrow.
Leonard: Great topic. I can help with that. There are lots of different perspectives you can take, economic, sociological, political.
Penny: Hey hey hey, this is my paper. And my perspective is that slavery is bad. Oh, and my professor's black, so I'm pretty sure thats the right answer.

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?

Leonard: I did a bad thing.
Sheldon: Does it affect me?
Leonard: No.
Sheldon: Then suffer in silence.

Stephen Hawking: What does Sheldon Cooper and a black hole have in common? They both suck.

Sheldon: Steven Hawking's a genius and he talks like a robot. It's everything I ever wanted in a friend.