Monday - Friday, 6:00 - 7:00 PM ET CNBC's Jim Cramer said Monday that reacting to market "false tells" can be a costly mistake for investors. "If you believe the constant barrage of negativity, you'll miss some incredible buying opportunities in great stocks that rarely come in," Cramer said Monday on "Mad Money," after the major U.S. averages finished in the green. The Dow Jones Industrial Average added roughly 1%, or 515 points, while the S&P 500 and Nasdaq Composite rose 0.54% and 0.56%,