Santa teaming with Merlin the Magician to defeat Satan? Charlie Brown’s Christmas with a Rudy Ray Moore-worthy soundtrack? And why are the prehistoric Flintstones celebrating a holiday rooted in the birth of Jesus? “The Online Movie Show” decks the halls with an encore presentation of its Christmas show starring Facebook’s funniest man, Anthony “Kingfish” Vitamia, in a roast of the silliest, most violent and least likely holiday movies of all time.