Aidan and I started speaking French spontaneously at the table, while he was working on his homework. Nothing particularly complicated.
Aaron was at the table with us, and Aidan directed a question at Aaron, "Est-ce que tu sais ce que je dis?"
Aaron responded in English, "I always want to say yes."
So, we encouraged him to say, "Oui," which he did.
A2: "Est-ce que tu n'est pas stupide?"
A3: "Oui."
M: "Il est intelligent, très intelligent!"
A2: "Est-ce que tu est intelligent?"
A3: "Comme ci comme ça."
And we all laughed :)