There was a link in the "related videos" that had some more info. Apparently the clip is based on a story by Mark Twain called _The Mysterious Stranger_ (link); part of a film called _The Adventures of Mark Twain (link)_,.
Wiki's summary of the actual story is a lot more interesting than the clip itself:
...one day, a handsome teenage boy named Satan (of the same angelic family, but not the real Satan, he tells them—actually, his nephew) appears, and performs several magical feats. Satan shares his ability to foresee the future and informs the group of unfortunate events that will soon befall those they care about. Of course, they don't believe the premonitions and it takes one of the predictions coming true to make believers out of them. Satan proceeds to inform them of each new tragedy that will befall their friends. The boys beg Satan to intercede, which he does but always from a cynical, technical definition of mercy; i.e. instead of a lingering death or multiple deaths, someone they care for will die immediately.
Mayhem ensues — witch trials, burnings, hangings, deaths, mass hysteria, and redistribution of wealth. Satan vanishes with a brief explanation:
Quote:
In a little while you will be alone in shoreless space, to wander its limitless solitudes without friend or comrade forever--for you will remain a thought, the only existent thought, and by your nature inextinguishable, indestructible. But I, your poor servant, have revealed you to yourself and set you free. Dream other dreams, and better!...You perceive, now, that these things are all impossible except in a dream. You perceive that they are pure and puerile insanities, the silly creations of an imagination that is not conscious of its freaks - in a word, that they are a dream, and you the maker of it. The dream-marks are all present; you should have recognized them earlier. It is true, that which I have revealed to you; there is no God, no universe, no human race, no earthly life, no heaven, no hell. It is all a dream - a grotesque and foolish dream. Nothing exists but you. And you are but a thought - a vagrant thought, a useless thought, a homeless thought, wandering forlorn among the empty eternities!
I'd say the filmmakers failed at remotely getting an idea like that across. It's a lot more than "evil forces cause bad stuff to happen to people."