Mark Twain wrote about a Mysterious Stranger — Satan (nephew to the real Satan) — whose purpose was to show humanity how worthless and inconsequential it really was. The book was edited after Twain’s death from several false-starts at a story; the book isn’t great, although this 1985 Claymation adaptation of the story strikes Twain’s sentiment home.
Plus it was good old-fashioned nightmare fuel. I saw it when I was quite young; while it didn’t terrify me, it did give me a certain insight…
