This happened to me a few years ago. Not really ghostly, but it scared me nonetheless. I was living with my partner in a new neighborhood. There weren't many people living in my street and there were no street lights yet.
My partner never took the keys to the house with him when he went to work. He always called for me when he came home. He worked nights, so he would wake me up between 12:00 and 1:00 am. Our bedroom was in the front, so from the bedroom window you could look right in the street.
One night, it was weekend, I had trouble falling asleep. I took a book and started reading. After half an hour or so I heard my partners voice, clear as day, calling my name behind the window adjacent to my bed. I did not react at once, because my partner had a noisy car (which I did not hear) and the porch made a rusty sound when you open it (which I also did not hear). But still I clearly heard his voice. I remained silent for I thought that if it was him he would call again. But he did not.
After another half an hour, or maybe longer, I suddenly heard the familiar noisy car coming up the drive way, the rusty porch being opened and my partner walking up to the bedroom window to call for me.
We related this to his mother and she said that something probably imitated him, since this is a 'ritual' he performs daily around the 'unholy hours'. Well, he broke that ritual at once, because ever since that incident he took his keys with him.