Captain von Trapp: Now, when I want you, this is what you will hear.
[blows whistle]
Maria: Oh, no, sir. I'm sorry, sir. I could never answer to a whistle. Whistles are for dogs and cats and other animals, but not for children and definitely not for me. It would be too... humiliating.
Captain von Trapp: Fraulein, were you this much trouble at the Abbey?
Maria: Oh, much more, sir.
Captain von Trapp: Hmm.
[starts walking away. Maria blows her whistle & he turns around]
Maria: Excuse me, sir. I don't know your signal