Luna raised her eyebrows, then shrugged. "I'm not really sure. I don't like accusing people when I'm not even sure it was them. I wonder how they would get into my dorm, so... Maybe it was just someone in my dorm."
She shrugged again. "I really don't know," she said, then smiled back when Oli smiled at her. "Right, well... Do you know where to find McGonagall's office. I think she still has the same one she had when you were still around. So... I guess this is goodbye for now."