No one mentioned Heathers or Mean Girls, but Heathers was the original. Also loved Dude, Where's My Car.
I don't think anyone mentioned Carrie, lol. oh, or Dead Poet's Society, loved it.
But yes, American Pie, Breakfast Club are classics. Ferris Buehller would have to be one of the best in the class.
I think more high school tv shows are more classic...Happy Days, Saved by the Bell, Dawson's Creek, Roswell, Gossip Girl (my current fave).