The chairperson selects an object/idea/whatever and announces whether it's animal, vegetable, mineral, and/or abstract. The others have to ask questions to figure out what it is. Whomever guesses the object correctly is given the chair for the next round; repeat ad nauseam.
[barbacoa] mythological and fictional is an old chestnut, and I still think there is a difference, even though it may be subjective and open to personal interpretation.