In the depths of Hogwarts there is a room that only opens on Friday the Thirteenth that holds a single bewitched bottle. When students are trapped within they find the only way to escape is to SPIN.

An elf. A Mrs. Santa Clause. Some mistletoe, and a bit of pink hair. When Ginny Weasley went to collect Neville for her costume party, she had no idea what was left in store.