suckers’ rally
n.— «They raise the hopes of investors. They occur out of nowhere. They can be money-making opportunities. But they tend to be fleeting. These are the stock rallies that occur when the economic outlook is bleak, news headlines are superpessimistic and the dreaded bear is still in control on Wall Street. They are often called suckers’ rallies or bear market bounces.» —“Is latest stocks bounce a suckers’ rally?” by Adam Shell in New York City USA Today July 27, 2008. (source: Double-Tongued Dictionary)