Some of the worlds deadliest creatures are easiest to miss. They are small, they hide in plain sight and they strike without warning. In Brazil, a barber sweeping his shop fails to notice the poisonous, wandering spider climbing up his broomstick and onto his arm. At night, on the paths of a Tunisian village, residents track down a lethal adversary with the help of ultraviolet light. As many as 100 glowing scorpions can be captured in a single evening. In Texas, a homeowner mowing his lawn accidentally provokes a colony of killer bees nesting under his roof. He is stung 162 times. Witness these and other harrowing encounters that take place when natures hidden villains slip into your car, your house, and even your shoes.