Quote from denner:
There were numerous "rip your face off" rallies and declines in the final hour back in 2008. Someone posted the largest percentage declines/rallies in history the other day. As you might imagine, a significantly large percentage of them occured in the fall of 2008. It was also very interesting for another reason. While prior to 2008, the consensus argument for buying into a crash was that 6 months later the market would be anywhere from 10-20% higher, that logic went out the window..as many of those downswings were simply the pre-cursor to more downside volatility.
One thing that always sort of annoys me is that people get a bit non-chalant if it's not a "crash" ala 1929 or 1987...while the reality is 3-4 days of serious declines are an equivalent percentage decline to a crash. For the majority of long only buy and holds the damage is the same.