Derek: Hey, how are you?
Meredith: I have a patient with a severed arm and no one seems to be able to find it. Have you seen it?
Derek: Your severed arm? No, I haven't seen a severed arm. Meredith--
Lexie (walks up): Hey, um, I'm so sorry about before, I was just so nervous about meeting you. Don't block the ER doors, I know that now.
Derek: You're the girl from the bar.
Derek: The girl from the bar.
Lexie: Oh, my god. Yeah. Oh, my god. Yeah.
Lexie: Oh, my god. You work here?
Derek: Yeah, I do.
Meredith: Girl from the bar? I'm the girl from the bar. (Meredith walks away)
Lexie: She hates me. My sister hates me.
Derek: Meredith is your sister?
Lexie: My half sister.