"It was Saturday afternoon and Jim was sitting on his couch watching a basketball game and drinking a beer, when the doorbell rang. Jim was confused, he wasn’t expecting anyone, so he almost didn’t answer the door because it was probably some door to door salesman he had no time for. But he did. He launched himself from the couch and swung open the door. And saw nothing. Something moved below him in his peripheral vision, and his eyes snapped down."