I just had an idea... Are any of you familiar with the Jungian concept of the "shadow"?
From Wikipedia:
"In Jungian psychology, the shadow or "shadow aspect" is a part of the unconscious mind consisting of repressed weaknesses, shortcomings, and instincts. It is one of the three most recognizable archetypes, the others being the anima and animus and the persona. "Everyone carries a shadow," Jung wrote, "and the less it is embodied in the individual's conscious life, the blacker and denser it is." It may be (in part) one's link to more primitive animal instincts, which are superseded during early childhood by the conscious mind."