Bonne Nuit on the island of St John is home to a rather unusual legend about a petrified horse. It's said that a sea sprite, smitten with Anne-Marie, plotted to kill her lover William. The sprite transformed into a white horse and lay in wait for William in his stable. But William, having had a premonition about the horse's true nature, took precautions by carrying a branch of mistletoe with him. As he rode the horse close to the beach, the sprite made its move, galloping into the sea to drown William. Luckily, William was prepared and struck the sprite with the mistletoe, turning it into a rock that remains to this day.

This legend has been passed down through the years, and while its historical accuracy is uncertain, it adds to the rich folklore of the Channel Islands. The story of the petrified horse has become a popular tale among locals and visitors alike, with many making the trip to Bonne Nuit to see if they can catch a glimpse of the rock. The fact that the location is a coastal area adds to the mystique, with the sea and its creatures playing a significant role in the legend. Although there's no concrete evidence to support the story, it remains a fascinating piece of paranormal history.