However, the vast majority of persons claiming to be ninja can uniformly be classified as "ninja- freaks." The typical ninja freak is seriously mentally ill, has limited contact with reality, and is invariably a social outcast. He has learned his "skills" through martial arts magazines and action-adventure movies. He may have purchased books (usually of dubious credibility) purporting to disclose "Secrets of Invisibility," or "Death Touch" techniques. The ninja-freak will always have a costume (usually either a polyester ninja outfit bought via mail order, or a black jumpsuit with mask and gloves) hanging in his closet, and will often walk the streets dressed entirely in black.