DeutscheBank's Agricultural ETF (AMEX: DBA) topped out a few weeks before the news of food riots, rice rationing at Walmart (NYSE: WMT) and Costco (Nasdaq: COST) hit the mainstream media.

Are smart traders using the wild and woolly headlines as a good opportunity to unload agricultural commodities on the unwary? It's a possibility.

The networks are going crazy, showing footage of food riots, and scouring the ends of the earth for stories about biofuels becoming a major reason for world hunger.

To be sure, it's hard to argue against the truth of what in some areas of the world is an increasingly difficult and saddening situation. But from an investment standpoint, it's possible that we may have seen a meaningful top develop in the agricultural commodities.

And if that's so, then it would explain why the restaurant stocks have rallied nicely in the last few weeks, even as commodity prices have been on the rise.

Indeed, this analysis is highly speculative, and we may be dead wrong. Still, it's well documented that when CNN is all over a story, and when the U.N. is a primary source of that story, it's awfully late in the game from an investment standpoint.

More important, the chart of DBA shows a double top in March, followed by a failed rebound in April, and rising volume as the fund failed to rally above its 20 and 50 day moving averages.

Rising volume when an ETF is looking wobbly, is usually a sign that more selling is straight ahead.

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