disclaimer : im not developer this game, but I live in indonesia
first :
almost java peoples believe if you want to talk with ghost, or do something "RITUAL" thing you have to take a bath with 7 flowers of shape, and why the lady ghost (kuntilanak) afraid with shape objects (nails, scissors) even with broom stick because some myth says they die with that object.
nail : myth says when you put nail in lady ghost head she will become beautiful women.
scissors : because lady ghost believe she is beautiful with long hair, she afraid when look scissors because people want cut their hair