This obviously didn't go very well as Spacey, who posted a tweet to his Twitter page during the demonstration, got this response from Letterman after he'd concluded his tutorial: "You know what it reminds me of? Oh yeah, a waste of time!"

For starters, Letterman gave a mea culpa and introduction to Lutz, calling him one of the "true greats in automotive design, marketing, sales and management...he's the man responsible for the Viper...a wonderful car. He's here with the Chevy Volt...and with any luck I'll get one of these babies for free."

Next, after the break, Letterman talked a little about the EV1 and how it's not from the planet Saturn. Then he wondered if building electric cars would have kept some dealers open. If it had, then damn, that's just one more reason to keep the internal combustion engine in our minds.

Then, after a Stephen Colbert interview, Dave made a bad pun about an electric car from Saturn running rings around...yeah...it was a bad joke. But, then "Maximum" Bob Lutz came out — looking quite dapper in his standard "old man business casual" threads.

Lutz started by walking Letterman through his C.V., then moved on to talking about marine aviation and owning two jets — probably not the best way to be seen as a company making cars for average A.I.G.-hatin' Americans.

Now we get into the meat n' potatoes of the interview. Letterman starts by asking whether there's light at the end of the tunnel for the American automakers. Lutz responds by saying that yes, they'll be restructuring and come out the end of the tunnel "leaner and lighter."

Letterman doesn't powder-puff it per se, but he's not exactly hard-hitting. First asking what people losing auto jobs should be expecting, allowing Lutz to throw down with "jobs returning in time." Still, he's able to pivot into asking Lutz about whether this was Detroit mis-management that got us here. Lutz responds by claiming there's more at play and lots of blame to go around — gas prices being a big part of it, but also that U.S. automakers built some bad cars from the 60s, 70s and into the 80s. He finishes his answer by saying the best way to combat that perception is by building better automobiles. We couldn't agree more.

Lutz addresses the issue of CAFE first by talking about building the type of vehicles Americans want to buy and how that's a shifting target thanks to fuel prices and American desire for buying the biggest vehicle they can for the cheapest price. Next, he responds with a hell of a good analogy that we've clipped and have over on the left. Something about how fat people won't get skinny just because you mandate clothing makers only making skinny clothes. Cue the commercial break.

And we're back with Letterman asking whether the EV1 would have kept the company in business. Lutz responds by saying "Sadly, no." He details the cost per vehicle was probably well over $100,000 per vehicle — and that it was a money-losing proposition.

Now let's get to the crux of the debate — Musk's Tesla versus the Chevy Volt. Lutz talks about batteries, price and practicality are the reasons for why it's a better fit for the American public. He even gives pricing details saying it'll cost $40,000, minus a $7,300 tax credit. Let's watch that now — plus the Chevy commercial at the break to see why Letterman's throwing softballs in his old age.

Back from the break and Lutz showing off the Volt and stating it meets regulations for all countries of any kind. And then my DVR crapped out on me. Let's rate the performance on a five star scale with five being the best.

Bob Lutz staying on message: ****
He's got to lose one star for the whole "I own two jets" thing in the beginning, but overall, a helluva job for a 77 1/2 years-old white Swiss-born man who works for GM. No "global warming is a crock" quotes for us to have fun with.

Dave Letterman's balls: *
Where did they go? Did he lose them in surgery a while back? Seriously — even if he was woefully ill-informed in his questions, we'd expect him to at least ask them, right?

Mostly Letterman wanted to know why Detroit's big car companies didn't come up with mass-market electric cars, and whether Tesla's Roadster really would save the planet. (He made a good point about carbon emissions from coal-fired electrical plants.)

But Letterman, when he let Musk get a word in edgewise, let him off easy. He didn't quiz Musk, for example, on whether the Model S show car Musk drove on set was the real thing. According to Dan Neil at the Los Angeles Times, it's not. The slapped-together prototype, a rebuilt Mercedes with a Tesla-designed powertrain, is "just barely ambulatory — more like a glorified golf cart than a harbinger of tomorrow tech," Neil wrote. And Tesla executives confessed to Neil that the car was far from being finished in its design, let alone production.

Here's another thing Letterman should have asked about: How is Musk going to build the Model S? Even if Tesla gets the $350 million in government loans it's hoping for — far from a sure thing — it will fall hundreds of millions of dollars short of the real cost of bringing the Model S to market. An insider tells us Tesla is about to close a new round of financing from a so-called "strategic" investor — that is, some industry powerhouse, rather than a traditional financier. Tesla almost ran out of money last fall, and has run on fumes since then, despite raising a $40 million round of convertible debt from existing investors.

Any new money will mean handing a large stake to the new investor. Daimler, which already has a deal to buy parts from Tesla for its own electric car, is a strong possibility. But will they leave a hothead like Musk, with his habit of stretching the truth, in charge? That's what Letterman should have asked — not if electric cars will come to market, but if Musk will be the man to do it.

More from the segment: