"That is the coolest thing that I've ever seen," teacher Martha Gietner said. "It looks like a person. It really does. I think it's a ghost."
The black image is then seen moving into a lighted hallway and casting a shadow.
Skeptics are having a hard time explaining what could cause a shadow and appear to float in the building at 2:51 a.m.
Video is here!
I doubt it's a bat, the shadow would be much more localized. My guess would be a tiny bug, buzzing at just the right distance from the lens to look like a human-sized blur on the floor, rather than a huge blob or a tiny speck. Shadows like that appear fairly often on security cameras, though it's rare that they'll be just the right size and situated against just the right background to make it look like a human-sized ghost.