It happened literally a couple of days ago - around the middle of the night, when our doorbell rang for no apparent reason. I was about to open the door to see what was going on, but my wife, who had just been having a zombie nightmare, stood in my way and simply turned off the doorbell.
I suspect that the doorbell was probably just jammed, but now we will never know the truth. But today's collection of spine-chilling stories about the scariest sounds people have ever heard in the middle of the night will definitely be replenished with another one.
More info: Reddit