Repeat A: What was that sound? B: What sound? A: It sounded like a whistle. B: I didn't hear anything. A: The sound came from you! B: I admit it, I made the sound. A: How did you do that? B: I made a whistle with a blade of grass. A: Teach me how to do it! B: Why do you want to learn? A: I want to surprise my sister when I get home. B: You're a mean older sister.