PITHY QUOTE FROM Reference
ass, Buridan’s. Since the Middle Ages this ass, associated with the name of Buridan though not referred to in his extant writings, has been invoked in discussions concerning free will and determinism. The hungry animal stood between two haystacks which were indistinguishable in respect of their delectability and accessibility. Unable to decide from which stack to feed, the ass starved to death.
Oxford Companion to Philosophy