Thats an amazing story because almost exactly the same thing happened at the last meeting I attended.
The WT study conductor asked a sweeping question to summarise the study. Something like "Why should we apply the things we have learned today in our lives?"
The answer he was looking for was along the lines of "Because if we do it will make us better people, Christians etc..."
After a short pause a little girl (his own 8yr old daughter) raise her hand and said "BECAUSE IF WE DONT WE WILL ALL DIE AT ARMAGGEDDON"
And you guessed it...
The whole congregation BURST OUT LAUGHING.
I felt a cold shiver go down my back. My own beautiful daughter was just under 2 at the time and just reaching the stage where if we whispered a simple one word answer in her ear she could raise her hand and parrot it.
I thought to myself "If I can get out now she will never remember ever being in this place"
We have never been back since.