How about this for a movie about metal - do it anthology style with like 3-5 15-20 minute stories about different aspects of the metal scene.
Scene 1: From the perspective of a young, new upstart van trying to play a local gig or even their first tour. Show the absurdity of loading up a van with $10,000 in gear to end up playing a 30 minute opening spot to a dozen or so people at a shitty local club. Maybe do it from their perspective where it looks like they are actually playing to a sold out house and it is an amazing show. At one point a hot chick jumps on stage and flashes her tits because why not. The moshpit is going nuts and they play three encores!
Scene 2: Same set up as the scene 1 but from the perspective of a fan or even security or the sound guy. Show the reality of the crappy local shows. Low attendance...the drunk metalhead screaming play that fucking metal while the other 10 or so losers shuffle around awkwardly as the drunk guy professes his love for metal and tries to get a circle pit going. At one point a guy in a gorilla suit can jump on stage and flash his tits, because why not. Eventually, after being heckled by the drunk metalhead the band plays one last cover song and packs up their gear. Drunk metal guy goes over to their merch stand at the end of the night and drops like $200 supporting them.
Scene 3: Filmed from like first person perspective like that old video Prodigy did for Smack My Bitch Up...but it is some meathead mosher as he goes to a death metal show, drinks at the bar, does the meet and greet with the band and makes everyone uncomfortable, gets fucked up in the mosh pit, 86'd by Security, pukes his guts out on the touring bands bus to end the night.
Scene 4:A bunch of metal nerds post on an online forum talking shit about Dave Mustaine, Lars, and Scott Ian from Anthrax. Cut to Dave Mustaine, Lars, and Scott Ian sitting around backstage talking shit about how terrible the fans are inn different cities, but you can tell the online criticism is really getting to them.
Scene 5: A semi-successful band as they are on the road between gigs. Talking about shows they have played so far. Flashbacks to previous nights on the tour and the highlights of different shows....gorilla man jumping on the stage, chick flashing her tits, meathead mosher puking out on their tour bus, shifty sound guys at venues, etc.