Considering the film is only 17 minutes long, and that half the interview subjects aren't even wearing shirts, you'd figure the job would be easy. But the original movie and the outtakes on the DVD contain about 30,000 individual frames, and Giffen scrolled through each one by one. What did he discover? Well, not surprisingly, Judas Priest shirts are pretty popular at a Judas Priest show. You probably won't be surprised to learn that there's a wealth of vintage Iron Maiden, Dokken, Metallica and Harley-Davidson shirts, either. But there's also an inordinate amount of ZZ Top tour tees, both a Union Jack and a Confederate flag, a Coors Light half-shirt and a shirt celebrating D.C. rock DJ "the Greaseman." And of course there's this beauty: