Mourioche- Brittany legend: a nocturnal, shapeshifting trickster spirit. It usually takes the form of a water horse with big, brawny arms. He pranks lonely travelers at night. He changes shape every time they turn around to look at him. His spine would extend to make room for more passengers and then he'd jump in the lake, laughing maniacally. He loves drawn out pranks, but he can be driven away if you do not fear en him.