BRIAN POSEHN9:30 p.m., Juanita's. $20 adv., $23 d.o.s.Brian Posehn's
been a dork for 30 years. Or so he confesses on his 2006 album “Live In: Nerd Rage.” Maybe so, but he's like the king of dorkdom. He wrote for and appeared on most all of the episodes of “Mr. Show.” Which led to an amazing string of guest spots on TV (as Ray Liotta's fictional cousin on “Just Shoot Me,” the Wisdom Cube on “Aqua Teen Hunger Force” and himself on “Tim and Eric Awesome Show”) and roles in a string of movies he's not afraid to admit mostly suck (“Dumb and Dumberer,” “Fantastic Four: Rise of the Silver Surfer” and, playing against type in the decidedly not-suck-y “The Devil's Rejects”). He's a stoner (he was in “Super High Me”). He's written a comic book about a zombie-slaying Santa Claus. He does voices for videogames. And he knows a lot about metal (he hosted a metal award show presented by Revolver magazine earlier this year). If you fall into any of those demographics, you should probably go to this show. Dry hilarity should ensue.