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Here’s how much the value of your car increases just because you’re famous

On this week's episode of CNBC's "Jay Leno's Garage," comedian Jeff Dunham shows off his 2008 Dodge Viper ACR. What does being owned by the famous ventriloquist do to the car's value? Auto appraiser extraordinaire Donald Osborne sheds some light on the question.

Today, this kind of car typically sells for about $105,000. Five years ago, it cost $123,000 because people were buying it.

What's surprising, though, is how demand for the vehicle has dropped off. The Viper is high performance and limited edition, released in the same year as the first ever ACR. But it's not just any old American Club Racer. It's 100 lbs lighter than most. It's faster.

"It's a hardcore ACR," says Dunham.

What's more, it only has 454 miles on it. So, for Osborne to find any flaws to knock its price down, he has to be nit-pickier than usual.

Jeff Dunham learns the true value of his 2008 Dodge Viper ACR

He points out a moth in the radiator, a little chip at the bottom of the spoiler and a minuscule scratch on the sill where someone presumably scraped their heal getting in.

"Excuse me. Excuse me, sorry," says Dunham, who licks his fingers and attempts to rub out Osborne's last finding.

"Let the record show that that did not actually cover the scratch," says Osborne, ruthlessly.

Why not flick off the moth? questions Leno.

"I'm not allowed to intervene, I observe," replies Osborne. The bow-tie connoisseur is a man of utter principle.

"This is why many appraisers are often beat to death," quips Leno.

So, how much is this specific car worth on account of its provenance? Does Osborne's apparent personal vendetta against Dunham affect that valuation? Watch the video to find out.

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CNBC's "Jay Leno's Garage" airs Wednesdays at 10 p.m. EDT.