The 12 Days of Christmas - Day 6
Today in the post, every wizarding household receives a plainly wrapped parcel. It contains a rather large goose egg with a familiar rune painted in black on the side.
It just sits there, nothing happens. It does not disappear, there is no note or whisper. The only thing odd is that you'll find it impossible to break, if you try, and you cannot tell what is inside of it.