When you hear the word "swoosh," you think of Nike . It's one of the most enduring logos in modern history. For decades, it's been plastered on everything. But, apparently, when investors hear "swoosh," they think of a wind gust — the sound of something getting passed by quickly. In this case that would again be Nike, the once-mighty athletic company that finds its stock in the doldrums. Wednesday was a particularly brutal day for Nike, with the company's stock dropping 16% , to its lowest