It’s such a fine line between clever and stupid, and this Spinal Tap-caliber cult item maintains a perfect balance. Writer-director Ari Gold stars as Power, a gangling spazz whose compulsive air-drumming to classic rock makes him village idiot of a New Mexico copper town beset by labor strife. Fired from the mine and estranged from his union-leader father (Michael McKean), he sets out to conquer big-league air-drumming in New Jersey. Bizarrely imaginative sight gags and laugh lines are timed like a Neal Peart solo, but the film also inexplicably succeeds as melodrama and heartfelt pro-labor statement. The wonderful cast includes the sublime Jane Lynch (Best in Show) and a raft of people we should have heard of already. 90 min.