Many investors deem banks like Bank of America (BAC 1.70%) and Citigroup (C 1.33%) to complex to invest in. Why then does Warren Buffett take such comfort in investing this the banking sector? The answer may be the way Buffett looks at the world and the nature of probabilities. In this segment of The Motley Fool's financials-focused show, Where the Money Is, banking analysts Matt Koppenheffer and David Hanson look at two tweets and discuss Bitcoin.