Voice of deceased Mom?

About a month after my Mom had died from cancer, I was at my parent's house in the summertime and was watering the hanging flower baskets. It was during the day and I was completely sober (haha)and while thinking of nothing in particular, I heard about 20 feet from behind my Mom's voice. It was almost "metallic" sounding as though she were talking through a metal tube. She said, "Hi, Jenny" (my name). It was clear as a bell and it made me stop what I was doing and turn around.

I know what I had heard and it was her. I wasn't even thinking about her when it happened. I was wondering if anyone has ever experience hearing their deceased loved ones? Also, why was her voice 'metallic' sounding? Tweet