LOL...yes a brother did also do that illustration in a sunday talk in my cong.
There was another one where a brother took three pieces of wood where one was labeled "satan" and showed how you could take the narrow end and shove a wedge between the other two blocks of wood representing you and your relationship with jehovah
and yet another one with the brother squeezing a spring in between his fingers with the spring representing your child and what happens when you lift your fingers off the spring and it goes flying accross the stage....
stimulating ....oh how I love not hearing "illustrations" anymore, a waaayyyy too overused speaking tool in JW-land- dont you agree?
CHG