Here's the scenario: You have now published your brainchild. Whether you have published traditionally or self-published, your book is now out there for the world to read. And the world does read. Your book becomes popular among your target audience (and maybe beyond). Everyone everywhere is reading it, and it's become as popularly read as Harry Potter, Hunger Games, etc.
Your book now has fandoms (found especially on Tumblr), and these fans are shipping characters left and right. You've become rather wealthy. It seem like only short while ago that you first presented your new book.
And then one day, an E-mail/phone call arrives.
Your book, the book everyone is raving about, is to become a movie! The rights have been all worked out, and the film making company (we'll call them Green Dragon Studios) has called/E-mailed you with what seems to be a once in a lifetime opportunity.
YOU get to pick the cast. Out of all the Hollywood stars and other, not so well known stars (think San Antonio Christian Film Festival actors), are at your choosing. You want Robert Downey Jr.? Done. You want the voice-actor who does Dot in 'A Bug's Life?' Absolutely.
What actors would you pick for your 'dream cast'? You can even elaborate on why you chose those actors. It can be because of past roles they've played, their real life personality, or just because you enjoy watching the actor act.
So far, I have...
Liam Neeson as Prince Seymour
Liam Hemsworth as Gabriel
Sophia Myles as Tae
Craig Horner as Orrun Annor
Those last two are just because they look like my characters when they are in character for other shows.
So what about you? You get to hand-pick the actors for the movie of your book. The movie won't be just like the book, but filmmakers don't want to risk your wrath, so the movie is really close to the book.
Who do you pick?
Well, for my yet-to-be-written work of awesomness, *cough* 
I wonder if I can fit Matt Smith in there somewhere...
That's a good point.
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