Hi, does anyone know what does this expression mean? "when the cow jumps over the moon". It appears in a film for kids. The king is telling his daughter that he is getting married very soon and that everything is already planned, and he says "Our wedding is already planned. When the cow jumps over the moon. And that is final". I thought it could be like the spanish expression "cuando el rio suena, agua trae" but I am not quite sure. What do you think? thanks.