I so wish I had the talent to come up with stuff like this:

Fortunately the guy who did make that projected video, Mark Gervais, is selling it on DVD so lesser talented people like me can scare the crap out of kids on Halloween. He uses a simple white sheet, a standard digital projector, and a good sized window. The results look great and are just the right level of scariness that most kids won’t be too afraid to approach your door.