I was speechless ...

This week I was teaching a 3 or 4 year old boy this summer, and I told him he was goofy. He asked what it meant and I said "Silly." He said "I'm not goofy." Then I thought of the character Goofy, so I asked if he was Mickey Mouse? He said "No. Mickey Mouse has big ears and tail." I said, "You don't have a tail?" He said, "No, I have a penis."