This eye-popping dividend yield may give you more headaches than passive income.It's tempting to gravitate toward dividend stocks that pay huge dividends. Take Walgreens Boots Alliance (WBA -0.35%) for example. The pharmacy chain's dividend yields over 11% at its current share price. In other words, investors get double-digit investment returns before factoring in any potential share price movement.However, there is never a free lunch in the stock market. It's rarely so easy.Peek behind the curtains and you ...