There was once a recluse who never left his home. The only time anyone ever visited him was when his food and supplies were delivered, but they never came inside. Then, one storm winter night when an icy gale was blowing, he had a nervous breakdown. He went upstairs, turned off all the lights and went to bed. Next morning, he had caused the deaths of several hundred people. How?
(hint this is based on fact and most likely would have happened anywhere between 1862 and 1990.)
He was a lighthouse keeper. He had turned off the lighthouse. Bad move.