SAM is alone in their house one evening when they begin hearing three quick knocks at the front door. Looking through the peephole, no one is there. The knocking continues at the back door and then upstairs. SAM searches the entire house but finds nothing. The knocking grows louder and does not stop. SAM curls up terrified as the knocking moves to the bathroom. With shaking hands, SAM opens the bathroom cabinet and screams. The camera pans past SAM's corpse covered in blood with a message in blood on the bath that reads "I Did Knock."