The Hogwarts staff, demonstrating a continued desire to impress the visitors from Beauxbatons and Durmstrang, seemed determined to show the castle at its best this Christmas. When the decorations went up. Hermione noticed that they were the most stunnings he had yet seen inside the school. Everlasting icicles had been attached to the banisters of the marble staircase; the usual twelve Christmas trees in the Great Hall were bedecked with everything from luminous holly berries to real, hooting, golden owls, and the suits of armor had all been bewitched to sing carols whenever anyone passed them. It was quite something to hear "O Come, All Ye Faithful" sung by an empty helmet that only knew half the words. Several times, Filch the caretaker had to extract Peeves from inside the armor, where he had taken to hiding, filling in the gaps in the songs with lyrics of his own invention, all of which were very rude.