This is actually not my story but this is my cousin's personal experience. My cousin Amber (not her real name) who was still 16 years old and a first year college of one of the Universities here in Cebu was watching a TV show after doing her homework. She was alone in the living room when my other cousin Ella (not her real name) 16 years old entered the room and asked for water, Amber just nodded her head because he was too busy with the TV show, Ella hurriedly went to the kitchen as if she was really thirsty. After a few minutes Ella went back to the living room and was complaining about the water being salty, Amber just laughed at her and thinking that Ella was just making fun of her. A moment later Ella went back to the living room and asked for water again, Amber found her so annoying she told her "You just came here a minute ago asking for water and now you're here again asking for the same thing!" To her surprise Ella answered "Are you sure? I couldn't have been here a minute ago because I just got home from school."
Could it be a Doppelganger? Why would she complain that the water is salty? Do they have the capability of hurting mortals? What should we do to keep them from entering the premises? I'm sorry for my English; I hope you understand my story!