Once upon a time in a forest like no other... there was a man, but this was no ordinary man. He was a cursed man. Every day and every night he transformed into a dark man, except for the night of the green moon.
The green moon only appears every 5000 years.
When the night of the green moon struck the earth the dark man was awoken. The dark man was dressed in a black, draping cloak. Every green moon he came into children's houses, and gave the children big presents, and then returned back to his lifeless forest pose.