"Since 1970, the average returns following 90%+ downside days are not only positive but higher than your typical day. It is higher not only the following day but also the following month and year. And as the second table below illustrates, it is more likely to be positive as well."
-from Saturday's What Now For Equities: "Embracing Panic"
Remember, this is just quant stuff, not a forecast, a direction to shade the bet, not whether or not to place a bet.
S&P 500 up 31.23 (+1.47%)
DJIA up 239.62 (+1.32%)