You might think that there could be nothing more horrific in the entire world than coming across a gigantic tarantula. But as you will soon see in the following video, there are things vastly morefrightening.After dousing a spider with poison, one Australian man probably thought everything was cool.But imagine his horror, when after killing the spider, a huge horsehair worm begins to wiggle its way out of the carcass.Horsehair worms are parasites that live in the bodies of their host during their larval stages.The news.nationalgeographic.com/news/2014/10/141031-zombies-para allow them to take over the body of a host. They can usually be found during the late summer, near streams and ponds, but are commonly noticed inwater containers such as bird baths, pet dishes, and swimming pools.