"Jesus related 30 - 50 parables/similes. Can you name just one which was to be understood as a prophecy? Just one!"
Utterly amaze them by showing that there is one - allegedly!
ka chap. 17 pp. 342-343 pars. 24-26 - "In this PARABLE the “slave” was not given silver “talents” with which to do business....No sooner did the spiritual “food” become available “at the proper time” on the festival day of Pentecost of 33 C.E., than the appointed “slave” class proved itself “faithful and discreet” by passing out the “food” under the inspiration of God’s outpoured spirit.... At this “proper time” it was that the “faithful and discreet slave” class fed them...26 Less than three and a half years later the feeding efforts of the “faithful and discreet slave” class were extended to other prospective “domestics.”"
I'm certain they will be delighted to learn of this wonderful piece of Bible trivia.