As FF says, kids can make very shrewdly mocking remarks, yet be very vulnerable to them. Sometimes you get a flash of real humor from small kids. One of my cousins at about age five when I had correctd him said:" I'll cut off your head and throw it in your face!" With a grin that proved he was aware of the incongruity. One time he made palm prints in fresh paint when I was painting his father's house. When I deadpan asked him who had done it, he replied with an equally straight face: "Ella Maud Rowe did it." She was a little African-American girl. When I asked him how he knew she was the culprit, he repllied " 'Cause it was dark, and I couldn't see her."