Anyone planning a fright for Halloween might learn a trick from a South American frog that dramatically fakes its own death, according to scientists.  Leaf litter frogs (Ischnocnema aff. henselii) of southern Brazil were recently observed playing dead by turning belly-up, shutting their eyes, and throwing back their arms and legs. The frogs stayed in their exaggerated death pose for about two minutes, according to a team lead by biologist Vinicius Batista of the State University of Maringá in Brazil and reported in the fall issue of the Herpetological Bulletin.