oh my gosh, I love Dead Poet's Society. Dr. Wilson! As a teenager! Will the madness never cease?
anyway I wanted to suggest "heathers" just cuz it's about teenage girls and like that's virtually synonymous with conformity but now that I actually think about it, that's not a good idea. but it IS a good movie, so watch it anyway.
Get something that tells you the uniform code of your school, and use that as an idea of conformity and be like I just insulted the school and it's ideals, screw your speech! It'll start conflict and irony and everything!
And have that "oh snap" looks about you while you give the speech but dont say it.