That looks like the work of owners who aren't even there. Nevertheless, I bet it's effective. Who would want to take a chance on breaking down the door and standing face to face with a woman who is so ugly that even the guy sleeping with her admits it?
A woman so ugly, he used her as a threat to stay away from the house. The only thing he left off his sign was: She is so ugly, her mother used to hang a pork chop around her neck, so at least the dog would play with her. LOL...