You can see the Christmas connections, Pfister said.

“This idea [is] that reindeer go berserk because they’re eating Amanita muscaria,” Pfister said. “Reindeers flying — are they flying, or are your senses telling you they’re flying because you’re hallucinating?”

Look at the Christmas decorations here, he said.

“We use — all over the Western world at least — these Christmas ornaments [which] have Amanita muscaria or other mushrooms.”

And finally, he said, consider the color schemes.