2.23 Blues For Sister Someone[Meredith runs to the elevator and sees Derek]
Derek: Well, hey. [Meredith sighs and tries not to laugh]
Meredith: Uhh, you picked up Doc?
Derek: Yeah, he's home.
Meredith: He seems to be doing much better.
Derek: He seems to be doing well.
Meredith: [laughs] I'm not laughing at you.
Derek: [laughs] No.
Meredith: No, it's just, you know...... bad sex isn't really something that wives want announced to the dirty-ex-mistress.
Derek: You're not the dirty-ex-mistress. You're a friend. She's your friend. I'm your friend. We're all... friends.
Meredith: But you didn't tell her.
Derek: No. [Sighs] How's your day going?
Meredith: The vet asked me if we...
Derek: What? What did the vet ask you?
Meredith: If we were together.
Derek: Uh huh.
Meredith: And I set him straight.
Derek: [Looks pleased. Elevator opens.] Good day Meredith.
Meredith: [smiles] You too Derek.
Meredith: [Derek looks stunned to see Meredith walking down the stairs, with wet hair and in Finn's shirt] Hey.
Derek: Hey. [Pissed face]
Meredith: [about Doc] Is he sick again?
Derek: [short, pissed off] Yeah.