The School Shooting
While Horror Story built its bread and butter on supernatural shocks, one of the single scariest plotlines of the first season deals with the Westfield High Massacre. It's just too realistic. While there are easily a dozen gorier scenes in Season One, even those viewers unmoved by the occult shudder at Tate's school shooting fantasies. . . especially after we find out that his fantasies are based on actual memories of the event.