When the village of Haddonfield discovered that the wizard Langenkamp was engaged in dark magic, they raised a mob and burned down the old windmill in which he dwelled. With his dying words, Langenkamp laid a curse on the villagers who sought his doom, a curse which would have come to nothing had Cropsy, a young farm labourer, not sneaked into the mill for a nap and been caught in the conflagration. The death of an innocent provided the mystic fuel for the curse, and now the people of Haddonfield are trapped with no hope of rescue.
It's a short piece, based on the One Page Dungeon concept, so should be easy to slip into an existing game or to run as a one-shot for Halloween. It lacks system-specific rules, but there should be enough information to make generating appropriate statistics easy enough. The scenario is more or less setting neutral too, although a general mediaeval fantasy feel is implied -- and easily changed if desired. It's also packed full of shameful puns and references, as is usual for me.
You can download Horror Comes to Haddonfield here. If you do run it, let me know how it goes!