A transcript of a conversation with the 2.9 year old follows.

Frank: You know, you’re not welcome downstairs with this kind of behavior.
Stuart: sheepishly: OK
Frank: Stuart, do you know what you did wrong?
Stuart: with a straight face: I can’t hear you!
Frank: not really sure what he just heard: Really?
Stuart: immediately: Yes.
Frank: trying to trick him: And what about now?
Stuart: Nope.
Frank: trying to keep a stern face: And now?
Stuart: figuring that the gig is up, smiling a little bit: Nope.
Frank: still trying: And now?
Stuart: showing glee: Nope.
Frank: can’t hold the laughter in any more
Stuart: neither can he