" Harry arrived early in the Room of Requirement for the last DA meeting before the holidays and was very glad he had, because when the torches burst into flame he saw that Dobby had taken it upon himself to decorate the place for Christmas. He could tell the elf had done it, because nobody else would have strung a hundred golden baubles from the ceiling, each showing a picture of Harry's face and bearing the legend: 'HAVE A VERY HARRY CHRISTMAS! "
― J.K. Rowling , Harry Potter and the Order of the Phoenix (Harry Potter, #5)