Jan. 10 Monday Movie Night w/ Heavy Metal Parking Lot Waiting Room, 6212 Maple St. 8 p.m., FREE, onepercentproductions.com Say it’s 1986, you’re a Maryland metalhead and Dokken is opening for Judas Priest at the Capital Centre in Landover — what are your plans before the show, dude? Naturally your spandex-animal-print-wearing, feathered-hair-having ass is tailgating hard outside the venue, blaring the Priest, crushing cans of Bud Heavy and talking shit about Madonna. That’s just what Jeff Krulik and John Heyn found when they rolled cameras in the parking lot, capturing metalheads in their natural habitat and resulting in this telling and hilarious documentary. Twenty-plus years later it feels like a glimpse into a time capsule. Clocking in at a scant 17 minutes, you’ll want more. But take heart that this cult classic short, now on DVD, allows a subculture at its peak to thrash on forever.