treaters) are bored so they grab some   snacks and go inside their cage/elevator to watch oogie boogie torture Santa   and Sally. And later, a thought to be dead Jack Skellington enters the lair   by jumping on the cage/elevator with the kids inside and he scares them   which can explain how he got inside the lair at the nick of time. Pictures   of the scene were in the promotional booklets, postcard books, and   storybooks. 