In 2008 we thought that the problem was contained to the subprime housing market, and once the Fed started supporting that market people breathed a sigh of relief and there was a rally and recovery from March-May. It wasn't until first Bear Stearns and then Lehman Brothers failed that people realized we were in a crisis. These were centuries-old, multi-hundred-billion-dollars institutions. The idea that they could cease to exist was unthinkable to anyone not actively looking at their balance sheet and doing the math, which is why there was such a panic when they did cease to exist.