How with the logic of "walls have ears"? Doesn't the logic of "There's mice in the wall and they have ears" or "There's a mouse in the house and it has ears, the mouse", appear sounder? Mice after all sit in walls and do have ears while walls don't.Persian seems to have a (funny) expression like "Walls have mouse and mouse has ears" or something the like. How come there is a mouse in the expression? Is there some logic to it?