Peering at the board in curiosity, Roze racked her brains to try and think of what could be doing it. Now, she herself was noticing the strange giggles surrounding them. Thinking back to what her brother had told her about Hogwarts, she looked up instead of around.
"Hmm.... I think it may be a ghost. Or Poltergeist. Apparently there's a rather energetic one in the castle called Peeves." Roze said out loud, still looking around them with suspicious eyes to see if anything would surface and prove her right or wrong.

[@TaliPaendrag]