Everyone's favorite horror anthology series, American Horror Story, has added Macaulay Culkin to the Season 10 cast. This will mark Culkin's first-ever series regular role in his storied career, although he has guested on TV shows like Hulu's Dollface and Robot Chicken in the past. The Mack's AHS casting was revealed in a mysterious announcement video shared to showrunner and series creator Ryan Murphy's Instagram. To the tune of the uber laconic "Dead of Night" by Orville Peck, the video shows us the name of the actors joining Season 10. Culkin's name is …