Cropsey

This starts out as an interesting documentary about a Long Island urban legend, but it's not strictly speaking a story about an escaped mental patient who kills children. While it seems to stray from the premise and slip down the rabbit hole completely at times, the film explores a number of real life horrors actually residing in the Long Island area with the idea that they may have helped to inspire the legend.

From a broken down home for mentally disturbed children that was shut down after a Geraldo Rivera expose' to a secret cult of devil worshiping transients, this movie makes a business of following both real news and random speculation to illustrate how truth can be stranger than fiction. It doesn't hold up the whole way through, in my opinion, but they find enough interesting ideas to hold your interest.