Christmas snow is a special kind of snow, endowed with magical powers that can make a snowman come to life. I've never experienced this firsthand--most of my snowmen tended to look a little Picasso-esque in my youth--but if you build a snowman out of Christmas snow, find a hat from a washed-up magician, and then truly believe in the magic of Christmas, yes, your snowman will come to life.
That's the point of the 1969 Rankin-Bass classic "Frosty the Snowman." Narrated by Jimmy Durante, the cartoon tells the story of a lovable snowman who befriends a group of school children when he comes to life via a magic hat. The cartoon gets a little traumatic--Frosty melts away in the end--but ends on a hopeful note that the kindhearted snowman "will be back again next year."
In the song, Frosty "begins to dance around" when the magic hat is placed atop his head. However, in the cartoon, the wise snowman gives the kids an avalanche of philosophical advice.
Okay, not really. He leaves them with this cryptic message instead: