The Nightmare Machine is an MIT project to use machine learning image-processing to make imagery for Hallowe'en.
The Face Generator isn't quite as successful as the filters that make scariness out of existing photos, but you can help train it. I suppose it's just a matter of time until someone adds the NSFW filter to these.
Since centuries, across geographies, religions, and cultures people try to innovate ways of scaring each other. Creating a visceral emotion such a fear remains one of the cornerstones of human creativity. This challenge is especially important in a time where we wonder what the limits of Artificial Intelligence are: Can machines learn to scare us? Towards this goal, we present you Haunted Faces and Haunted Places: computer generated scary imagery powered by deep learning algorithms and evil spirits!
NIGHTMARE MACHINE [MIT]
(via Dan Hon)