Ok, full disclosure, the original image is a piece of artwork by the amazing Christopher McKenney who makes a plethora of hair-raising ghoulish images.

But, this hack seems do-able, according to this tutorial, which urges you to get a doll, drape fabric over it and spray the hell out of it with fabric stiffening spray.

Then, hang it on some invisible string to scare the living daylights out of family members, neighbors and unexpecting trick or treaters.