"Shadow People" is the common name for a strange phenomenon in which someone sees a disembodied shadow of a humanoid creature and feels an eerie, cold presence, often accompanied with a feeling of fear or despair. Shadow People have been seen and in fact photographed many times, and have several different appearances.
Some say that they are ghosts of the dead, while others say that they are a type of demon or alien. Some claim that they are simply hallucinations or illusions, or are actually the shadow of a real person that is simply not seen.
See also Fear Liath.