PG-13 | 1h 41m | Comedy | Feb. 20, 2015 High school movies are an American institution. No other country is as infatuated with high school as we are. Ever since 1973’s “American Graffiti,” there’s always been a gaggle of unknown actors in them who quickly segue to stardom: “Graffiti” begat Harrison Ford and Richard Dreyfus, “Dazed and…