'Twas a long time ago, longer now than it seems in a place perhaps you've seen in your dreams. For the story you're about to be told began with the holiday worlds of auld. Now you've probably wondered where holidays come from. If you haven't I'd say it's time you begun.

The Nightmare Before Christmas (1993, director Henry Selick)

1650. Muggleborns all getting together around Christmas time to each sing the part of a character from The Nightmare Before Christmas’s ‘This Is Halloween’ - Hagrid walks past the group whilst carrying a tree for the Great Hall, with a group of pure-bloods behind him. Both Hagrid and the group of Pure-Bloods are utterly baffled as to why this group of students are singing about Halloween when it is nearly Christmas.