When it comes down to it, we really don't know very many things about American Horror Story season six. Of course, we have a few scarce plot details from Ryan Murphy, and we have more than enough theories to go around, but right now, that's about it. One of the most contentious rumors involves the potential inclusion of Slender Man, a fictional Internet monster known for driving his victims insane. What would it be like if the entity appeared on the show? Find out what some of the biggest stars had to say.