Penny: Hey, you look deep in thought.
Leonard: Ah, I'm just reflecting.
Penny: About what?
Leonard: The first time we slept together.
Penny: Oh, honey. Don't beat yourself up; it's great now.

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?

Sheldon: So the doctor prescribed Nizoral and it blocked enzyme action, and the fungus cleared right up.
Mrs. Fowler: That's a very disturbing picture.
Sheldon: Yes, well, they say a picture's worth a thousand words, but I say nothing beats a picture and a thousand words.
Mrs. Fowler: Still, you might want to take it off Facebook.
Sheldon: Oh, no. It's in my nature to share.

Mrs. Fowler: I don't know about you, but I don't really like magic.
Sheldon: You just keep getting better and better.

Howard: Hey, have you checked the dates on these? They're all expired.
Stuart: You buy candy in a comic book store, you get what you get.