Lacking comedic value, Jack Black’s “Tenacious D: The Pick of Destiny” plays like the aftermath of a bad overnight binge session.

Black’s previous movies have been good for the most part. But there are few, if any, redeeming qualities that pull this movie out of uselessness. Black plays JB — so original — a black sheep in his religiously devout family. After defying his father, he seeks guidance from Ronnie James Dio, the former lead singer of Black Sabbath, who tells him to go to Hollywood to complete his dream.

After meeting KG, (Kyle Gass) the movie turns into one long montage of bong hits and terrible jokes.

Once forming the band Tenacious D, the two learn from a Guitar Center employee (Ben Stiller) that all the greatest rock guitarists have had a magical pick that gave them special “rock” powers. The two search for the pick so they can win a talent show — the cash prize will help them pay rent.

The band experiences turbulence, JB experiences a ridiculously long mushroom trip and eventually they reach the Rock and Roll History Museum, the place that houses the Pick of Destiny. After evading police by climbing through sewers and getting to their gig, the pick is stolen from them by its rightful owner, Satan. The band enters into a contest with the devil to decide who rocks the hardest. Songs written by Tenacious D support a good amount of the plot but they are not nearly as interesting as songs put on their self-titled debut album. The best parts of the movie are references to jokes on that debut album.

The movie never veers from its downward spiral of fart and drug jokes. The humor may only be appreciated by a certain group of people in a particular state of mind; otherwise it provides no source of coherent entertainment. Black and Gass are both very funny people, but this movie does not reach anywhere near their potential.

These two should stick to music and let Black act on his own.