29th of November, 2007 - bond market experiences a flash crash which is quickly bought up by the FED in an effort to prevent widespread debt defaults. Worked for a few months only for companies to begin defaulting anyway, probably through a series of realized margin or interest spike risks. This is what caused the financial markets to implode in 2008.
Watch and study the bond market, it can tell you more about medium to long-term market direction than any other indicator.