Dave (Just arrived back from the planet Venus and brought this thing with him. Thought it was a simple souvenir but he doesn't realize that thing feeds on oxygen and will double in size every few hours. Within a few days it will be bigger than the planet earth. And eventually it will eat the whole planet just for the oxygen. Then it will travel through the universe in search of more oxygenated planets to feed his undying hunger to grow and consume more and more oxygen until the universe will become unstable and collapse within itself. Bad dog!)

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