Back when I was a jw, I had 4 over the course of my 5 years as a pioneer.
An elderly man with alzheimers - we studied the my book of bible stories because he didn't remember anything.
A man who knew the Bible better than I did, but didn't live by it - he said it was a nice historical book.
A teenage boy who didnt want to study, but his mom made him.
A teenage girl whom I turned over to a pioneer sister.
Of these studies, I didn't prepare for any of them. I didn't want them. I hope they never join.