When it happens (which is rare because I guess I have lots of issues, and I like to gab), I usually say something like, "Sooo...today I got nothing so it's a good time for you to ask me something you're curious about." Because he usually lets me direct conversation, and rarely asks questions, unless it's to clarify something. I actually don't remember if he asks me anything substantive, but that's usually enough to get things flowing.