I am still trying to figure out how he does this, but a friend just emailed me a link for a product called Hallowindow by Mark Gervais.
It is a DVD that you project at the window to greet your trick or treaters! Check out these demos:
This is what it looks like outside a real window
I am thinking you need a projector and DVD player...but it is still very cool!
Here is the link for his site: HALLOWINDOW
pistachio cake - Now that I’ve gotten a few bigger projects out of the way — hooray! And more soon on all of that, eee — I have a little more time again to do the things ...