Going to a his book reading and Q & A and need some advice..

I'm going to a book reading in a few weeks and there will be a Q and A.. and want to have some really good unique questions, not the same old questions he must get asked all the time... so I thought I would try here..
Anyone have any cool ideas and questions I could ask? I will be sure and post his answers if I get a chance to ask?

Thanks so much!