More fun than a night in the mosh pit, director Penelope Spheeris’ documentary look at the Southern California hardcore punk scene of the late ‘70s and early ‘80s mixes interviews with the bands and their slam-dancing fans with raw, frenetic concert footage. Among the featured performers are Black Flag, Circle Jerks, Fear, Germs (whose lead singer, Darby Crash, died before the film’s release), X, and more. 100 min.