or my fave is alway the fact that Dubs can now take blood fractions, I ask the questions where does the blood fractions come from and instead of them saying the obvious answer which is blood, they start talking about the synthetic form, then I bring back around to the human form.
I like the look on JW's faces when I tell them my Dad, based on the teachings of the Witnesses, died from not taking a Blood Transfusion and then about two years later the Leaders decided that it was OK to use the fractions of the blood donated by non JW's. How is that "abstaining" from Blood? Stops em' in their tracks every time. Actually I feel bad for them because I realize (looking back), I too was only prepared for scripted objections.
The thing is (and we've all seen this) they are lead to assume that no one out there knows the Bible like they do and that everyone else is in darkness and it's up to them to show the world the error of it's ways. They are used to being around people who are only allowed to agree and never question (at least out loud) and have received their training from these same people. Can you imagine if they prepared for "real" controversial objections such as blood fractions,child molesters or failed prophecies, during a demonstration at the Service Meeting? They might actually open up a conversation about these things within the congregation and that would be dangerous. Instead JW"s are trained to approach the householder or whomever, with the innocuous canned questions they have been trained to use as an opening for them become officious and begin dishing out, unsolicited and often inaccurate information. They feel they are ambassadors of Jehovah and are acting in an official capacity. They aren't being themselves when they are being officious and when they are confronted with an idea that they haven't thought of before, it can really rattle them and it brings them down off their official pedistal and causes them to look inward at their own beliefs.