There are persons who can move their ears, either one at a time, or both together. There are some who, without moving the head, can bring the hair down upon the forehead, and move the whole scalp backwards and forwards at pleasure. Some, by lightly pressing the stomach, bring up an incredible quantity and variety of things they have swallowed, and produce whatever they please, quite whole, as if out of a bag. Some so accurately mimic the voices of birds and beasts and other men, that, unless they are seen, the difference cannot be told. Some have such command of their bowels, that they can break wind continuously at pleasure, so as to produce the effect of singing. I myself have known a man who was accustomed to sweat whenever he wished.

—Augustine, The City of God