This is the prototype shown in this movie. The model in the magazine is a bit shorter and so sits on the head better. I also used a black ribbon in place of the maroon one.
The project requires two costume "coachman's" hats, plywood, some small pieces of wood, two L-brackets, two springs, a brake cable and lever, a cable crimp, some washers and screws, and...brace yourself...a rubber finger puppet. Terrifying!
Here's a link to the MAKE store where you can get the Halloween issue, which is full of nothing but DIY Halloween projects.