Normally I don't like videos, and they don't seem to be too welcome on this forum, but these are neither cheesy nor do they give away entry or location info (at least not that I can tell). And they're pretty well done - stop motion from the looks of it.
http://www.youtube.com/watch?v=bX9o3uAeVD8
http://www.youtube.com/watch?v=bX9o3uAeVD8
