Grey's Anatomy Season 3 Episode 7

(Bailey assigns Cristina to monitor the boy who ate the Monopoly pieces and sift through his stool)
Cristina: Dr Bailey, isn't this more of a nurse's job?
Bailey: Are you too good to help that boy?
Cristina (scoffs): Yes... No. Definitely not. I just thought I'd be of more help if I was assisting you in a surgery.
Bailey: No surgeries for you.
Cristina: I'm sorry, I don't understand.
Bailey: I don't understand why you erased my name from the OR board.
Cristina: No, I, uh, don't know what you're talking about.
Bailey: Don't do that. Don't give me that fake, confused look. It irritates me. You know exactly what I'm talking about. You erased my name from Burke's Humpty-Dumpty surgery. I know it and you know it. What I don't know is why.
Cristina: I... have no comment.
Bailey: No surgeries, Yang.