My wrong call offers lessons for investors.When it comes to investing mistakes, one of the costliest was underestimating the severity of the 2022 bear market. That led me to make bad bullish calls on some stocks that had lost more than half their value -- and kept falling.One of those stocks was Snap, Inc. (SNAP 1.30%). It had lost more than half of its value, and when it came to Snap stock in the next five years, I speculated that it would beat the S&P 500. Unfortunately, nearly 2.5 years later, the Snapch ...