Amy: You wouldn't be dating Penny.
Leonard: You don't know that. I've been going to the Cheesecake Factory for years. I could have picked her up.
*Everybody laughs*
Penny: Oh, you weren't joking?

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

Leonard: What am I supposed to do?
Penny: Err, keep your mouth off other women.

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

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.

Howard: I've never done this before, it's kinda fun.
Raj: Yeah, if your mom could see her little Bar Mitzvah boy, she'd have a heart attack.
Bernadette: Good idea. I'll take a picture.

Amy: Did you hold the baby?
Sheldon: I did.
Amy: And how did it make you feel?
Sheldon: Looking into the blank, innocent eyes of a creature that couldn't begin to comprehend anything I was saying ... basically another day at the office.