May 22, 2006
"HONG KONG (MarketWatch) - India's benchmark Sensex dropped more than 10% in the first two hours of trading -- prompting officials to issue statements reassuring investors -- before recouping to end the day with a 4.2% loss.
Trading was suspended for an hour at noon after the index fell by its 10% daily limit, losing 1,111.7 points. It hit an intraday low of 9.826.91. By day's end it was down 456.84 to 10,481.77...."
I think it's safe to say that when a market has a 16% swing in one trading day, there has to be a bit of concern... I'm not saying that the US markets are going to crash, but a 5%+ down day is certainly not out of the question.