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: Early this morning, Capital One Southcoast upgraded Goodrich Petroleum (NYSE: GDP) to "add," saying the stock's "valuation and the Tuscaloosa Marine Shale acreage acquisition" (announced today) made the company a good investment. As you might expect, the stock promptly popped 12% -- but then it cratered. Why?

So what: As I mentioned last month in relation to Capital One's upgrade of Newpark Resources (NYSE: NR), Capital One has the anti-Midas touch when it comes to oil stocks -- everything it touches turns to lead. One of the worst-performing analysts we track, the majority of Capital One's oil picks actually underperform the market, with the result that Capital One underperforms more than 80% of the investors we track.

Now what: No mystery here. If Capital One tells you to buy a stock, odds are the smarter play is to sell it -- or at least not buy. And Goodrich seems no exception. Here, we've got a profitless company with a -194% "profit" margin, and well over $400 million in net debt.

Yep, folks. Looks like Capital One has found itself another "winner." Probably best to join the crowd on this one, and dump it.

Not scared yet? Still got at least a little interest in Goodrich Petroleum? Add it to your watchlist and see if I'm wrong.

Fool contributor Rich Smith does not own (or short) Goodrich Petroleum. The Motley Fool has a disclosure policy. Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors.