(Changing Bailey's baby's diaper)
Cristina (singing): A, b, c, d. (stops singing) Oh, gross. (starts singing again) E, f, g, this really couldn't suck any worse.
Richard (appearing in the door way): Dr. Yang.
Cristina: Oh, uh, Dr. Webber.
Richard: What's that smell?
Cristina: Uh... it's feces, it's baby feces. We had an incident, sir.
Richard: Are you having trouble with the diaper, Yang?
Cristina: Sir. No, sir.
Richard: Because it looks like you're having trouble with the diaper.
Cristina: No, sir, I've got a... I've got a MD from Stanford and a PhD from Berkley, I can handle this diaper. Unless you want to?
Richard: Uh... n-no, no. It's alright, it's alright, you carry on.