worst possible news at the worst possible time

Bear Stearns blew up. It was the worst possible news at the worst possible time. A day earlier, the politically-connected Carlyle Capital hedge fund defaulted on $16.6 billion of its debt. Carlyle boasted a $21.7 billion portfolio of AAA-rated residential mortgage-backed securities, but was unable to make a margin call of just $400 million. (Where did the $21.7 billion go?) The news on Bear was the last straw. The stock market started reeling immediately; shedding 300 points in less than an hour.