What would you ask?

I'm seeking your help.  If you were granted the once in a lifetime chance to interview a ghost what would you ask? I have some ideas of my own, but I want this project to be relevant to you so I am seeking your assistance and guidance.  Please use the comment section for this post to pose your questions and once I have enough I will use them in an upcoming work that you will see posted here first.  I thank you in advance for your assistance and continued readership.