Succumbing to peer pressure

'Grease's final message may also be its most problematic.

By the film's conclusion, Sandy arrives at the funfair dressed in a tight leather jumpsuit with a cigarette in hand – something Sandra-Dee would never do. After Danny sees his old fling, he immediately falls for her, and the two drive off together to live happily ever after.

Essentially, the crux of this character shift - and the ultimate message of the entire picture - is that succumbing to peer pressure and rejecting what makes you unique is what young people should strive for.