Some dead leaves still have a little bit of green in them and turn to vampirism, sucking the remaining life from the veins of other leaves to preserve their own. They can only be destroyed by strong light or driving a rake through them.
This photo is backlit by a computer monitor, with no zoom, getting right up in the creature's face. The leaf is lying flat on my desk, but the angle of the lighting makes it look like it's standing up.
I did nothing to the leaf to create the demonic face, bat wing profile, and expression of dreading the light behind it. I found it like that.