Leonard: Were you seeing other men?
Penny: No.
Leonard: Aren't you going to ask me?
Penny: Come on, really?

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.

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

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

Bernadette: I like the Wii.
Sheldon: Thanks, Grandma.

Sheldon: Oh look, a quarter!

Sheldon: Boy, do I have to urinate.
Leonard: If only there were a solution to that.