guests at an aquarium in Sydney, Australia, were watching a huge tiger shark swim around a tank when suddenly the shark started acting strange. It began violently shaking and swimming around as fast as it could, periodically bumping hard into the walls. And then, finally it just stopped and slowly sank to the bottom of the pool. What the shark did next horrified the onlookers and sent many of them running from the building to call the police. But, when police arrived, they were less interested in the shark, and more interested in what was now floating on top of the water in the shark tank….