THIS brave man would put TV explorer Bear Grylls to shame - using a human-eating piranha as a pair of scissors.  Taken in Cuyabeno Rainforest, Ecuador, the clip shows a man with one of the deadly fish held tight in one hand. But as it flaps its tail, unable to escape, he slowly lowers a twig into its mouth full of sharp teeth. And the fish shows how it earned its fierce reputation by effortlessly slicing through the stick with its fangs.  After chomping through the twig, it bites again - making it easy to imagine it slicing through a person’s leg. The video of the animal being used as a tool has become a web hit, viewed by almost a million users worldwide.                                       –TS