Banks now carry very large amounts government debt on their books and they show these bonds as assets on their balance sheets. Governments have "encouraged" banks to buy these bonds. Interest rates are now rising quickly so that these "assets" are dropping in value. That means that the book value and capital ratio of banks is now changing rather quickly which can't exactly be what the Fed had in mind. Same problem for anybody who has PM's as an asset on their balance sheets since metal prices are dropping, or for people who are thinking about getting a mortgage or refinancing. All the math is changing to the downside. So as near as I can tell this jump in interest rates is going to be a big problem and I am guessing that the Fed is going to be back soon with another announcement or eles the party might stop too soon. 
