Squirrels cause power problems...
A Bay Area squirrel caused a power outage which ultimately disrupted Caltrain service for commuters and cause phone problems for 42 local schools. Sources say the squirrel did not survive.
A squirrel also caused a power outage in Anderson, Indiana.
...and fire
A squirrel nested in a North Carolina attic, but then set its nest on fire after chewing on electrical cords. The second story of the home was damaged, but no humans were injured.