Four years after buying the sea rock it lived in, redditor GCS_3 discovered that he had a bobbit worm in his saltwater aquarium. That explained why some of his fish had mysteriously disappeared. In the wild, bobbit worms can grew to almost ten feet in length, although the average is about a yard long. This one was measured at eight inches, after it was "euthanized." The consensus is that it should have been nuked from orbit. See more pictures of this scary worm at imgur. Link
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