You would expect the king of the gods to have a pretty massive ego, but even by that standard, Zeus is a real piece of work. He swallowed his first wife, Metis, whole. His courtship, if you can call it that, of Hera (who was also his sister) involved transforming himself into an adorable cuckoo bird; he also used the animal trick on mortals, committing rapes in the form of a bull, a swan, etc.