Me, asking Gabe, not expecting a comprehensible answer: "What do you want for breakfast?"
Gabe: "Da da da da budder."
Me: "What else?"
Gabe: "Da da da toe." In context (Savi had asked for toast with just butter on it), it was clear that he was also asking for toast with butter. That may have been the first time he verbally answered a non-yes-or-no question in an understandable and sensible way.