Quote from Janitor in My Sacrificial Clam
J.D.: [v.o.] You see? Nobody keeps John Dorian from moving on. Nobody. Janitor: We've secretly replaced this doctor's blood with hepatitis blood. Let's see if he notices. J.D.: You know, I could be really sick here. Could you be nice for once in your life? Janitor: [pulls a cheerful grin] How's that?