The standard procedure is to call some heavy hitters in the institutional investment community and ask them what's moving the market. First guy says spiking oil is depressing the market. The second and third guys say profit taking is afoot. Fourth guy says Greenspan burped at lunch.
Once in a while, a good and humorous article pops up in Google News. And this happens to be just the case. Read all about the dismal science of deciphering Alan Greenspan's speech.