Satire

Satire is a genre of literature, and sometimes graphic and performing arts, in which vices, follies, abuses, and shortcomings are held up to ridicule, ideally with the intent of shaming individuals, and society itself, into improvement.^[1] Although satire is usually meant to be funny, its greater purpose is often constructive social criticism, using wit as a weapon.

 http://en.wikipedia.org/wiki/Satire