What scares a ghost? Something must have frightened this poor guy, since he's running for his... uh... life? Death? Whatever.
This is one of my favorite nebulae in the sky, and if it looks familiar, it should: in a bizarre - and literal - twist of fate, it's actually the picture of the Witch Head Nebula turned sideways!
I love that you can take an astronomical picture related to Halloween, turn it 90 degrees, and get a different Halloween picture! Turn your head to the left to see the Witch.
If you have a hard time seeing it, the ghost is running to the right; the upswept arc on the right is his arm (the Witch's chin), his head is the bump to the left (the Witch's lip), his other arm is the arc on the left (the Witch's nose), and his ghostly feet dangle below. Image credit: Rogelio AndreoOriginal blog post: The Top 14 Astronomy Pictures of 2010