I'm curious for the answers too.
There are people conversation comes naturally with. I screen for people I can communicate well with, to avoid the awkward situation the question is asking to prevent.
But I have met many clients too, who guard their personal life so much that any question feels like I am breaching some guarded privacy. Questions a client can ask an SP, might be useful as well to try and communicate with people who are so skeptical and guarded. I won't even put myself in a position to be around them at this point, because I can't/won’t get comfortable around someone I can't communicate with. It just leads to a lot of awkward silence.