It is all foolish superstition. If you have not done anything evil, nothing to fear. Those departed are gone forever into nothingness. No amount of burning of joss sticks, candles, incense papers, etc will mean a thing to them. Supernatural events may occur but no one can tell what it is. This planet is full of mysteries. Since some people are gullible, others take advantage of them. Con Hee is one of them.