According to radio show host Harold Camping, this event has partly occurred on 21 May, 1988 and 7 September, 1994. A follow-up will occur on 21 Oct, 2011.
What?
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Various stages of the "End of the World". His "Rapture" prediction for May 21, 2011 didn't see much happen, but Camping, whose organisation collected a lot of money to publicize the event, has refused a refund
saying “We’re not at the end, why would we return it?”