iRobot Roombas are small, robotic vacuum cleaners that can operate automatically. But that independence also means they can get into mischief. A man in Oregon called 911 after he heard strange noises inside his house. When deputies arrived, they found the culprit was a Roomba. Something similar happened to a family in North Carolina, who heard noises in the middle of the night and thought they were the victims of a home invasion. The intruder turned out to be their two-day-old Roomba.