If you're a Hollywood screenwriter, or a horrible, horrible doctor, the most convenient of all mental disorders is multiple personality disorder. In Wisconsin, psychiatrist Kenneth Olson hit the mother load when he convinced a patient she had 120 separate personalities. And these weren't all just sissy personalities like "sociopathic killer" or "sexually promiscuous narcoleptic," either. She also had the personalities of a duck and the devil. Please take a moment to figure out which one you personally feel is more fucked up.

The doctor also admitted to having performed an exorcism on her, a course of treatment he thought necessary based on his diagnosis that she was a bride of Satan after having been ritually raped by upwards to 70 men and animals. After watching several reruns of Frasier, we're fairly confident this sort of mental health diagnosis is very rare.

Faced with the daunting task of treating so many personalities, and lord knows duck psychiatry is a niche market, Dr. Olson did what any irresponsible doctor would: He charged all 120 for treatment and billed Blue Cross for $300,000. Inexplicably, after this, and performing an exorcism on the woman, the good doctor ended up in court where she won a $2.4 million settlement against him. However, if you feel yourself being tormented by devil ducks any time soon, Dr. Olsen still has a practice in Montana and will likely be happy to see to your mental health needs.