The hard-rocking duo, who recently played to a packed house at the Bill Graham Civic Auditorium, has never lacked for confidence, even back when they were toiling in relative obscurity in movies like the 1996 Pauly Shore comedy Bio-Dome. Having long ago proclaimed themselves the Greatest Band on Earth, D frontmen Jack Black and Kyle Gass recruited countless converts to their cause in 2001, with an eponymous debut album of lascivious power ballads and brazenly self-aggrandizing anthems.

Perhaps it should come as no surprise, then, that their new movie, Tenacious D in the Pick of Destiny, has been billed as The Greatest Motion Picture of All Time. It’s a label neither bandmate will dispute.

“Is it the greatest?” Gass muses. “That’s not for us to – well, yes, I’m afraid it is. Name a great movie. Gone With the Wind? More like Gone With the Dullness. Our movie is much funnier. It’s got better costumes. It’s shorter, so you don’t have to be in the theater that long. And it rocks so hard your face will melt.” As if to emphasize the point, he leans back on his designated nappy-time sofa and, with a serene, almost expressionless gaze, unleashes an audible wind of his own.

“Sometimes, Kyle’s farts are clean,” Black helpfully offers. “But that didn’t sound too good.”

“I have to be relaxed, I have to relieve all my tensions,” Gass explains, with another sonorous blast. “Even if they’re in my ass.”

Gass, who often plays the mild-mannered straight man to his frenetically charged and better-known partner-in-crime, is famously portly, with a hairline no longer worthy of the name – not quite the prototypical rock god. But neither he nor Black plans to trim down, especially with Thanksgiving Day at hand.

“The key to Thanksgiving is good food,” Black says, eyebrow arched and voice booming as his train of thought gathers steam. “The food… and the ambience. Don’t forget the ambience! I’m talking about dark woods, and a nice little view of Nantucket. Leafless trees out the window. A nice merlot. Oh… and family, too.

“This year, we’re going to be playing in Chicago, but our tour manager has arranged for a kick-ass chef to have Thanksgiving dinner with his family and then come back to his restaurant to make an epic meal for the band. For the D!”

“I love Thanksgiving because it’s a celebration of food,” Gass adds, contemplating all things caloric and girthful. “You need a big, juicy turkey, the family and a good football game.”

This year, of course, the D has a handy remedy for the infamous post-turkey blahs – a screening of The Pick of Destiny. Two, if possible. 

"Go catch the movie and see for yourself how great it is," Gass exclaims. "Then, go home and listen to the album a few times, forward and backward. Watch the movie again the next day and you should be fine. You'll have all your bases covered."