Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Knightsbridge Tankers (Nasdaq: VLCCF) fell more than 11% in early trading as Mr. Market threw his hands up and ran outside into the traffic, screaming about the end of All That Is And Ever Will Be.

So what: Yeah, OK, not literally. But the market is taking a beating today for reasons that have little do with Knightsbridge. China's surprise trade deficit and Spain's debt downgrade shook investors who had taken comfort in the idea that we're in the midst of an economic recovery.

Now what: Knightsbridge, for its part, is in the business of shipping oil and dry bulk goods. Broad economic weakness or serious disruptions in the oil markets would have an impact. Investors seem to believe either is a possibility.

Either that, or they're just dumping an 8% yielder on a day where traders and Big Money investors alike are dumping everything short of this caffeinated champ.

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Fool contributor Tim Beyers is a member of the Motley Fool Rule Breakers stock-picking team. He didn't own shares in any of the companies mentioned in this article at the time of publication. Check out Tim's portfolio holdings and Foolish writings, or connect with him on Twitter as @milehighfool. You can also get his insights delivered directly to your RSS reader. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool is also on Twitter as @TheMotleyFool. Its disclosure policy is at least 10% better than other disclosure policies.