They eat them to stay high so they don't crash land when pulling Santa's sleigh.
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The guy who came up with the idea that Santa Claus has flying reindeer is probably the one who ate the mushrooms :)
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How do you think Santa’s Reindeer stay up? The fact reindeer eat Fly Agaric and aren’t affected yet the tribal shaman would take a pinch and go into a day long trip to the spirit world gave rise to the idea
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