I imagine it went something like this...
Agent: "John, baby, they want you in Italy for this messed up fairy tail deal. You play the king, but you only get four lines before you die off camera. You'll be on set for like two days, at scale."
John C Reilly: "A funny king?"
Agent: "No."
John C Reilly: "Pass. You know I hate to fly!"
Agent: "You get to touch Salma Hayek on the cheek..."
John C Reilly: "When's the next flight to Italy?"
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Agent: "Vincent, baby, the want you in Italy for this messed up fairy tale deal. You play a sex crazed king who has constant orgies with nubile young women except for when you have sex with a really old woman."
Vincent Cassel: "When will I get a role that challenges me as an actor? How is this part any different from my last weekend, or the weekend before that? Oh, the ennui!"
Agent: "So you wanna pass?"
Vincent Cassel: "No, I'll do it. Sigh.."
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Agent: "Toby, baby, they want you in Italy for this messed up fairy tail deal. You play a king who has a giant pet, uh... flea."
Toby Jones: "I've always wanted to work with a flea!"