Aristophanes 
The Frogs [EPUB ebook] 

The Frogs tells the story of the god Dionysus, who, despairing of the state of Athens‘ tragedians, travels to the underworld to bring the playwright Euripides back from the dead. He brings along his slave Xanthias, who is smarter and braver than Dionysus. As the play opens, Xanthias and Dionysus argue over what kind of jokes Xanthias can use to open the play.