Stocks plunged today, with the Dow sinking more than 400 points, as nervous investors ran for the exits and into some safe havens. U.S. Treasuries rallied, with the 10-year yield hitting a record low. Worries about a slowdown in global growth weighed down commodities, with copper, oil and silver prices sinking. The selling started early, with world markets logging steep declines, following the Federal Reserve's gloomy outlook and weak manufacturing data from China. Adding further pressure to U.S. markets was the latest jobless claims report, which was worse than expected/Chicago Tribune. More here. (AP photo)

Question: How do you react to a day like today when the Dow dive-bombs more than 400 points?