Chemtrails are mysterious trails left in the sky, and conspiracy theorists often use it as evidence that Santa is attempting to again take over the world with biological weapons. These floating phenomena are similar to air craft contrails, but normally linger for longer and are arranged in elaborate high-altitude constellations in the sky. These trails are thought to be left by 3 of Santa's Reindeers, specifically Cupid, Vixen and Comet(disputed).