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the Great Collapsing Hrung Disaster of Gal./Sid./Year 03758 which wiped out all the old Praxibetel communities on Betelgeuse Seven is shrouded in deep mystery: in fact no one ever knew what a Hrung was nor why it had chosen to collapse on Betelgeuse Seven particularly.
Ford Prefect's father was the only man on the entire planet to survive the Great Collapsing Hrung disaster, by an extraordinary coincidence that he was never able satisfactorily to explain.