Many people find serial killers fascinating. I think one of the things that draws us in is the appearance of normalcy that hides the violence and depravity below the surface. We are brought to wonder how well we really know our neighbors, our friends, our co-workers, even our relatives. In today’s song, “John Wayne Gacy, Jr.,” Sufjan Stevens meditated on this, and takes it one step further: how well do our neighbors know us? And how well do we know ourselves? What would be revealed if someone were to enter our own lives and pry up our floorboards?