When it comes to bailouts of American business, Barney Frank and the Congress may be just getting started. It turns out the abyss is deeper than most people think because there is a second mortgage shock heading for the economy. If you thought sub-primes were insanely reckless wait until you hear what's coming. One of the best guides to the danger ahead is [investment fund manager] Whitney Tilson. We had the greatest asset bubble in history and now that bubble is bursting. The single biggest piece of the bubble is the U.S. mortgage market and we're probably about halfway through the unwinding and bursting of the bubble," Tilson explains. "It may seem like all the carnage out there, we must be almost finished. But there's still a lot of pain to come in terms of write-downs and losses that have yet to be recognized." The trouble now is that the insanity didn't end with sub-primes. There were two other kinds of exotic mortgages that became popular, called "Alt-A" and "option ARM." The option ARMs, in particular, lured borrowers in with low initial interest rates - so-called teaser rates - sometimes as low as one percent. But after two, three or five years those rates "reset." They went up. And so did the monthly payment. A mortgage of $800 dollars a month could easily jump to $1,500. Now the Alt-A and option ARM loans made back in the heyday are starting to reset, causing the mortgage payments to go up and homeowners to default.