Explain this to me

For two weeks, the financial world has been telling us they need a bailout. Without it life as we know it will cease. When the bailout was delayed last week, the Dow Jones suffered its largest single day drop (measured in points) in its entire history. Today, on anticipation of the bailout passing, the market was up three hundred points. Then the House passed the bill and rushed it over to the president for his signature. And the stock market dropped five hundred points! I don't get it.