Jewish folklore are legends, music, oral history, proverbs, jokes, popular beliefs, fairy tales, stories, tall tales, and customs that are the traditions of Judaism. Folktales are characterized by the presence of unusual personages (dwarfs, giants, fairies, ghosts, etc.), by the sudden transformation of men into beasts and vice versa, or by other unnatural incidents (flying horses, a hundred years' sleep, and the like). A number of haggadic stories bear folktale characteristics, especially those relating to Og, King of Bashan, which have the same exaggerations as have the lügenmärchen of modern German folktales. There are signs that a certain number of fables were adopted by the Rabbis either from Greek or, indirectly, from Persian and Indian sources.