They are described as blurs of smoky darkness, columns of dark thick something, silhouettes of a man in top hat, silhouettes of a man with out a house, a man like dark shape. Sometimes with eyes glowing red. They have been reported, and allegedly caught on security cameras, in homes, businesses, and on the street. Most agree they emanate evil.
Some suggest there has been a spike in reports since about 2000. Others, suggest that the reported fondness of them for closets and similar spaces means they are merely the old bogeyman in a new set of clothes. Yet, most older tales of spirits utilize different motifs and archetypes.
Are they simply the dark, elongated and upright version of the ancient incubus, succubus, ghost, vampire, or demon? Are they simply new creations produced in response to contemporary fears of a vague "something" that will come and get us?