If I say, "Bailey peed on me," I think it's safe to assume it's my son.

Meredith

Cristina: Who's Dr. Boswell?
Callie: She's the woman Arizona slept with last night.

I'm not going anywhere. Me and this baby got Bailey stuff to discuss, don't we, Mr. Derek Bailey Shepherd? Yes, we do.

Bailey

Think of Sheldon when you apply it.

Penny (hands Howard the coupon)

Penny: "50 cents off Vagisil"
Sheldon: Think of me when you apply it.

Sheldon: Careful, Amy. The friend of my enemy's girlfriend is my enemy.
Amy: Really?
Sheldon: Yes. You're either with me or against me.
Amy: Do you want to take the bus to work?
Sheldon: Maybe there's a third option.

Penny: He's still mad at Leonard, huh?
Amy: Well, he's mad at you, too. He said you were the succubus that led his friend astray.
Penny: I don't know what succubus is, but it has "suck" in it, so that can't be good.

Howard: No, I am definitely up a cup size.
Raj: You, know, b-but they're very firm, so you've got that going for you.
Howard: You think?
Raj: Yeah. Yeah. Yeah. Very perky.
Howard: Thank you. I really needed to hear that today.

Hey, easy. My nipples are sensitive.

Howard

Jump up and down -- let's see if they jigggle

Raj

I need you to be honest with me. Do my boobs look bigger to you?

Howard

Sheldon: Now I think I hear kissing.
Amy: Like you know what kissing sounds like.
Sheldon: There's kissing in Star Trek, smarty-pants.