'Twas the night of Christmas at a North Carolina house, no creature should have been stirring, not even a mouse. But a Forsyth County couple awoke with a fright, as something was moving about their house in the night. They dashed to their closet and hid in fear, dialing 911 with a sensitive ear. Responding sheriff's deputies searched the home, and found a robot vacuum alone. The source of the scare had quickly been sorted, the sheriff's office reported.