One Roman emperor was so crazy that he planned to appoint his pet HORSE to serve as consul. He also declared war on Neptune, and had his soldiers stab the sea with their swords.
Caligula kept his favourite racehorse, Incitatus, inside the palace in a stable box of carved ivory, dressed in purple blankets and collars of precious stones. Dinner guests were invited to the palace in the horse's name. And the horse, too, was invited to dine with the emperor.
He also had the heads of the Roman gods removed and replaced with his own likeness. Unsurprisingly, the Senate had him assassinated before the horse could be made consul.