IT is that Stephen King book about a scary clown fighting a bunch of kids, except there’s also a lot more to it than that. The clown is actually a shape-shifting entity that emerges every 27 years to do horrific things, and the clown is, furthermore, just one of the appearances it takes on while terrorizing the people of Derry. But the image of a particularly scary (or at least scarier than usual) clown and a gang of young heroes endures, maybe thanks to the miniseries and two-part movie adaptations of IT.