Although Coca Cola ads have played a large part in Santa Claus iconography, there are some who would aver that Santa Claus' appearance is based on the hallucinogenic Amanita muscaria mushroom.
Navigate over to any one of the sites linked above, and read the tale of the mushroom-costume wearing shaman who harnesses psychedelic urine-consuming flying reindeer to his sleigh, and enters the smoke-holes of the yurts of the world's children. No wonder the guy's so jolly!
Gather my children, come into the room
And hear of the saint who's dressed as a shroom.
He slides down the chimney and never gets hurt
The chimney's the smoke hole of a herder's yurt
The sleigh that he rides in, it surely can fly,
The reindeer that pull it are screamingly high.
Although dear St Nick is all strung out on drugs,
It could be much worse, kids, you could all be Thugs
The stoner who visits you is much more jolly,
Than four-armed, skull-necklaced bloodthirsty Kali.