I'd go with #1 here. The little brother seemed like he might have seen it before too from his body language during bits where he was focussed on near the bath ghost scene. Besides, a dangerously hot daughter and mom pair are pretty likely to get haunted by the kind of creeper that haunts the bath.
Thanks for putting it into words, I was slightly pondering "pervert ghost?" And now seeing it read, that thought is really solidifying as the most likely option. Now...is it a pervert for just our lovely "deers," or En-kun as well? Maybe it's horrifying reaction is solely for men who shower, and ruin its good time.
I suppose one could add the "absurd" or "surreal" tag, but early John Cusack films are still in the comedy section, not the "Surreal and Absurdist '80s Comedy Romance" section.
@Kryspy_Kreme
Isn't it? Since the chapter when she ran as fast as she could from her Ex to embrace her true love, it's done nothing but shatter my expectations and make me laugh.