Daniel 4:33

The same hour was the thing fulfilled upon Nebuchadnezzar, so that there could be no doubt as to cause and effect; and he was driven from men and did eat grass as oxen, and his body was wet with the dew of heaven, till his hairs were grown like eagles' feathers and his nails like birds' claws. This form of insanity is well known to medical science, a few cases having been found from time to time which exactly agree with the description of the symptoms here given, even to the eating of grass and the living outdoors without clothing; since people in this condition often believe themselves to be wolves, it is known as lycanthropy.