This oil trade takes the cake.

At the zenith of the speculative bubble in the oil patch -- when crude hit $147 per barrel in July -- you had everyone from T. Boone Pickens to Prince Alaweed touting $200-per-barrel oil by the end of the year.

Crude is now trading around $40 -- down $107 per barrel in less than six months. Unbelievable!

And this latest drop comes after OPEC voted to cut daily production by an eye-popping 4.2 billion barrels per day.

Looks like the world is awash in crude oil.

Needless to say, those euphoric longs in the oil stocks got destroyed. Most energy stocks lost 50% to 70% of their value during the course of the sell-off in crude.

And remember those television commercials with T. Boone and Chesapeake Energy (NYSE: CHK) CEO Aubrey McClendon pushing for the expansion of natural gas?

Well, natural gas prices are down 60% from their mid-year highs.

If you put money into T. Boone's Clean Energy Fuels Corp. (NASDAQ: CLNE) as recently as September, when the stock was trading at $20, you now own Mr. Pickens' vision for $5.

For those of you who own blue-chip stocks, this is an eye-opening prediction. An article at CNBC.com talks about the possibility of Dow 10,000. Dow 10,000!

I repeated that in case you didn't get it the first time. It sounds pretty scary to me, and it should sound pretty scary to a lot of you out there. I'd have to presume that most investors don't use the stock market primarily as a substitute casino for the times when Las Vegas is out of reach. Many of you out there must own a Disney (NYSE: DIS) or a Coca-Cola (NYSE: KO), maybe a General Electric (NYSE: GE) or a Microsoft (NASDAQ: MSFT), something generally considered core and safe for the long-term. I happen to own the first three. Anyone who does is in for some huge volatility if Dow 10,000 comes along.

Actually, whether it comes along or not, volatility is here to stay. And here's the thing about the Dow 10,000 prediction: it isn't so farfetched on a mathematical basis. When you first read that number, you say to yourself "No way, that would be like a depression!" But because the numbers are getting higher, the actual point moves aren't as dramatic as they may seem on the surface. If we hit 10,000, that would represent a decline of approximately 29% from the high reached back in October 2007. As I write this, the Dow is about 20% off the high. Is another 9% feasible?