Quadrophenia (Franc Roddam, 1979)
This annoyed me at the time - like Animal House - because it was not historical. It was smearing late seventies ideas of street credibility over sixties mod. I thought it very doubtful that a top face would be working at a scrap yard, for instance. But who cares? I've seen it many times since and it's an excellent teen movie: a great soundtrack, strong cast - a new generation of actors like Ray Winstone, Phil Davies, Mark Wingett and Phil Daniels, who would go on to have lustrous careers - and an archetypal loner-vs-the-gang storyline. It's noticeable that as Jimmy gets weirder, he gets more androgynous. As the film goes on, the activities of the gang get so tiresome you don't blame him for breaking away.