If you handed most people nearly $400 billion, they'd find plenty of silly ways to squander it. Warren Buffett isn't most people. The legendary investor — known for his patience, discipline, and love of a bargain — said last year that he would happily put $100 billion to work if the right opportunity arose. But he resisted any urge to go on a last-ditch spending spree in his final quarter as Berkshire Hathaway CEO. The message to shareholders from Berkshire's fourth-quarter earnings report,