When I was young, my family lived in what was an old farmhouse. One day, when I was about 8 years old, I was sitting by myself in the newly remodelled living room watching TV. My mom and brother were both upstairs. All of a sudden I had this feeling of being watched. It started to get rather intense, and it made me very nervous. I had felt this before in the same room, but at this moment, it was much stronger than it had been in the past. As the feeling got stronger and stronger, I got more and more nervous. I started to sweat and shake. I hugged my knees to my chest, summoned up all of my courage and asked, "Who are you?" To my surprise, I got a reply. A man's voice said my father's name as clear as a bell. My father was away from home, travelling on business, so it could not have been him, but it sounded just like him. I was, of course, completely freaked out. I ran upstairs, and tried to pretend that everything was ok. I asked my brother if he had been talking to my dad on the phone just then. That of course was not the most logical explanation, but I was a young kid and scared out of my wits. He said that he had not been talking to my dad.
From then on, I avoided that room altogether unless someone was with me. I did learn later that my father was named after his father. My grandfather died when my dad was a teenager, so I never met him. My dad was technically a "junior," but stopped using the suffix after his dad died. He didn't discuss his father with me until I was a bit older.
One possible explanation is that it was my grandfather, but I keep coming back to the idea that it was someone else, trying to mimic my father's voice.