Warren Buffett famously advised investors to “be greedy when others are fearful.” With stocks all over the world getting clubbed in recent days, there is no shortage of fear out there. The question is: will all that negative sentiment become another “wall of worry” that the markets climb to new highs? I can’t say for sure. No one can. I will say that during yesterday’s gruesome selloff, I spent more time adding to my fund’s short book than searching out potential buys. That’s because, even with the Dow and S&P suffering their worst weekly declines in four years, I still see wildly, even stupidly overvalued companies everywhere I look.