"In fact, very few people on the face of the planet know that the very shape of the M25 forms the sigil odegra in the language of the Black Priesthood of Ancient Mu, and means ‘Hail the Great Beast Devourer of Worlds’.

The thousands of motorists who daily fume their way around its serpentine lengths have the same effect as water on a prayer wheel, grinding out an endless fog of low-grade evil to pollute the metaphysical atmosphere for scores of miles around.” 

~ Good Omens