Tonight we celebrate Halloween, our great national secular holiday by doing the mad money way by talking about the stock of Hershey. Not because it makes a huge percentage of the candy that you'll probably be giving out tonight, but because Halloween is supposed to be scary. And for the past 3 weeks, almost nothing's been more terrifying than being a Hershey shareholder.The stock has plunged from 196 in its highs earlier this month to 169 in change as of today. When the company reported yesterday morning, i ...