Getty Images / Bill Pugliano Warren Buffett shared an unfortunate anecdote in his annual shareholder letter. One of Berkshire Hathaway's businesses, Lubrizol, suffered a fire last year. Luckily for Lubrizol, insurance will cover a lot of its losses. Unluckily for Buffett, Berkshire owns one of the key insurers that will pay out to Lubrizol. "The Bible instructs us to 'Let not the left hand know what the right hand doeth,' Buffett wrote.