I don't think there's any questions that get through to the dyed in the wool JW because they believe that shit 100% as I used to do also.
With me it was looking at Scriptures and looking at the org. Jesus said "come to me all you who are toiling and loaded down and I will refresh you." Why did I seldom feel refreshed after attending the meetings? Why were we being loaded down with petty rules? And why did Jesus say "come to me" when we were knocking on doors telling people to "come to the WT organisation“? That is just one example.