People fear a variety of things that are countless. Some of these things are because of incidents that took place in their early days. Incidents that planted deep roots of fear in their unconscious mind, leading them to shiver once they see these objects. They fear dogs, spiders, or elevators, under the name of phobia. Phobias can be hereditary or acquired because of the surrounding nature factors. But these things we fear are so specified and well known. The only and the most effective way to escape this deadly fear is to avoid these things that frighten us. But what do you expect when danger is mysterious? When you don't know what you are afraid of. There is danger, and maybe it's serious, but you can't define its source.