The Patient of Darkness

The Patient of Darkness (暗闇のペイシェント, Kurayami no Peishento) is the second story of the sixth episode of the anime series Full Metal Panic? Fumoffu.

Summary
To teach a stoic Sousuke the meaning of fear, Kaname takes him into a haunted hospital, but she becomes more scared than Sousuke. They learn that the haunted hospital rumor was perpetuated by the mother and son living there who wanted peace and quiet.