Somalia:. Where Hyenas Are Used to Treat Mental Illness

"There is a belief in my country that hyenas can see everything including the evil spirits people think cause mental illness," says Hab. "So in Mogadishu, you will find hyenas that have been brought from the bush and families will pay £350 ($560) to have their loved one locked in the room overnight with the animal."
The expensive treatment - more than the average annual wage - is as brutal as it sounds. By clawing and biting at the patient, the hyena is thought to force the evil spirit out. Patients, including young children, have been known to die during the process."

I am skeptical.

http://www.bbc.com/news/magazine-24539989