This is a horror staple - young men and women spend a night of terror in an isolated house.
何か出そうな定番の場所ですからね。自動演奏するグランドピアノや独りでに動き出す人体模型や。
That's because they're the classic places for 'something' to appear. Like the grand piano that plays by itself, the human anatomical model that moves by itself ...