What would you ask an author?

I'm going to start doing author interviews on this here blog, so I wondered if you had any burning questions you'd like me to ask writer-types.

I'm looking for something a bit different to the "Where do you get your ideas from?" kind, but not quite as random as Smash Hits-style "What colour is Tuesday?" (It's yellow.)

Tell me in the comments please. I'll send a booky prize to the suggester of my favourite question.