Boanthropy

Boanthropy is a mental disorder where the victim believes he or she is an ox. The Babylonian king Nebuchadnezzar is considered by some Christians to be one of history's few documented sufferers. "He was driven away from people and ate grass like cattle. (Daniel 4:33b NIV)

The word also appears as a word to be spelled in the Broadway play The 25th Annual Putnam County Spelling Bee.