San was thinking...

We were all sitting around the living room, the kids were talking, telling stories, etc. San said something (I don't remember what) and then looked at me with this face. Of course I knew immediately he wasn't telling the truth. I told him he needed to tell the truth. He looked shocked and said, "You can tell I'm lying???" I said yes, to which he replied, "I thought boys could spot liars and girls had eyes in the back of their heads!"

Gramma, do you know anything about that?