A photographer was confused when he left his shed a sloppy mess every night and found it cleaned the next morning. A video camera revealed the culprit. It turns out that he had a Welsh mouse, which used to be thought of as good for nothing, but turns out are perfect for cleaning garages and sheds. The little buggars apparently have a genetic deficiency that causes OCD behavior, including the cleaning of small, dark rooms. They only take a vacation day (night, actually) once every 100 days (nights). So get one while they are still available. Everybody is going to want one. Mouse filmed tidying up Powys man's shed every night