In the age of fan service meaning big money for movie studios, there's very much a feeling that something worth doing for effect has either already been done or will be at the earliest possible moment. If there's some call from potential audiences to see something - whether that's an adaptation of a hugely successful book series, a sequel, a pay-off to something previously seeded or the meeting of two characters or actors on screen for the first time - the conversation about it happening will already have happened in a boardroom somewhere.
10. Voldemort Returns - Harry Potter & The Goblet Of Fire
Obviously, Lord Voldemort's first appearance in the Harry Potter movie franchise comes at the end of the first movie, when it turns out he's living on the back of Professor Quirrell's head, but fans of the books and the films had to wait another four years before we got to see the real deal.
And for all of the changes Mike Newell chose to make to the original TriWizard Tournament from the books, the climax of the fourth Potter film delivered on that much-hyped moment wonderfully.
Set against the wonderful atmospherics of the graveyard, Ralph Fiennes' supernatural, serpentine performance and striking, creepy look were everything fans could ever have wanted. He was a colossus, almost viscerally affecting and haunting in a way that's usually reserved for horror movie villains and the almost flippant command to murder Cedric Diggory is like a grim crown on his reveal.