If you say "You're the one that I want", you answer me unremittingly "oh oh oh": you're a real Grease fan! Proof, you know the dance steps of Danny Zuko on your fingertips and you even have all-in-leather sandy for the big evenings. However, the movie released in 1978 still has little secrets for you.

• None of the main roles was played by the top picks!

It's amazing when you know the success of the musical film for 30 years: none of the main actors in the feature film were the producers' first choice. The role of Danny was to be played by Henry Winkler, alias Fonzie in "Happy Days" and Sandy was to be played by Susan Dey, known at the time for his character in "The Patridge Family".

• We see Lorenzo Lamas, the actor of the Rebel!

Impossible to know that the long-haired bad boy who has fantasized thousands of housewives made his debut in Grease! Do you recognize him? It is the charming ideal son who seduces Sandy at the beginning of the film ...

• Sandy leather legging was sewn on Olivia Newton-John

Yes, Olivia Newton-John is charming and unveils a sumptuous body in the last cult scene of the film, to the very point that you complexate every time you put on leather pants. And well forget your complexes: the legacy of the beautiful Sandy was sewn directly on the actress, otherwise she did not fit in!