Few minutes ago I started a pot of coffee. The coffee maker makes deep sputtery noises. I walked into the other room for a second and suddenly heard what sounded like a kind of demon voice grumbling my first name. Got chills for a second till I realized it was a trick of the accoustics here: just an extra loud splutter from the coffee maker resonating in the room behind me. Last year a similar thing gave me wicked goose bumps. It was a hot summer night and I had a box fan sitting in front of a door open to the outside. The fan was on high. Suddenly a new noise started on top of the fan noise and crescendoed. It sounded exactly like a male voice groaning and seemed to come from just outside the door. I was pinned to the spot with fright and stared out the door but there wasn't anyone there. When I calmed down I examined my first suspect: the fan. It turned out to be sitting off balance on a pebble, and must have been sent rocking back and forth on top of the pebble till it changed position and the noise stopped.