The mutilators haven't made one misstep. They leave their calling cards, but no one has ever surprised them at their work. They leave too much evidence for any rational person to deny they exist, but never enough to be identified. No one even claims to have taken a picture of them. Afterward, of course, thousands are taken. They're obviously playing with us like a cat plays with a mouse. And it's driving folks, including the authorities, right up the wall.