The evil clown is a subversion of the traditional comic clown character, in which the playful trope is instead rendered as disturbing through the use of horror elements and dark humor. The modern archetype of the evil clown was popularized by Stephen King's 1986 novel It. The character can be seen as playing off the sense of unease felt by sufferers of coulrophobia.
The modern archetype of the evil clown has unclear origins; the stock character appeared infrequently during the 19th century, in such works as Edgar Allan Poe's "Hop-Frog", which is believed by Jack Morgan, of the University of Missouri-Rolla, to draw upon an earlier incident "at a masquerade ball", in the 14th century, during which "the king and his frivolous party, costumed—in highly flammable materials—as simian creatures, were ignited by a flambeau and incinerated, the King narrowly escaping in the actual case." Evil clowns also occupied a small niche in drama, appearing in the 1874 work La femme de Tabarin by Catulle Mendès and in Ruggero Leoncavallo's Pagliacci (accused of being a plagiarism of Mendès' piece), both works featuring murderous clowns as central characters.
The modern stock character of the evil clown was popularized by Stephen King's novel It, published in 1986, which became the first to introduce the fear of an evil clown to a modern audience. Another one of the first appearances of the concept is that of John Wayne Gacy, an American serial killer and rapist arrested in 1978, who became known as the Killer Clown after it was discovered he had performed as Pogo the Clown at children's parties and other events; however, Gacy did not actually commit his crimes while wearing his clown costume.