Whistling Whilst Walking

D: [whistling]
S: You can't ever make fun of me for whistling off key!
D: But, I'm not off-key
S: Maybe not, but you can't whistle
D: Yes, I can whistle!
S: Just because you can make noise, doesn't mean you should open your mouth and whistle!
D: Well, I don't tell people to quit TALKING!!