This story by Fredric Brown begins and ends with what some claim is the shortest horror story ever written: The last man on Earth sat alone in a room. There was a knock on the door… A scientist wakes to find himself in a cell. The previous night Alien invaders had collected 217 animal species, including him, for study. They then destroyed all other animal life on the planet. He devises a clever way to convince the aliens that living on Earth is not a good idea. After they have all gone, he hears the second knock on the door.
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