Trick or Treat Ghost Picture

Michele McDermott sent this ghost picture. Seems there was more than kids dressed up as ghosts out that night! Do ghosts like candy? This is an fine example of "ectoplasm." Looks like a big face!

"I took this picture around four years ago of my children trick or treating. I was out with my parents, and my kids and none of us smoke! What do you think this could be. It was cool outside this night, but it wasn't or hadn't been raining. No one had a fireplace going, that I know of. This was taken in Baltimore, MD."