There's two different ways that I've come up with to do this, though I can't say I've gotten any results to speak of.
The first method is to give a comment as if you're a complete hardliner. An example of this is a comment I wanted to give during the book study a few weeks ago. The paragraph said something about his God cleverly had the Bible written in such a way that it exposed those with a"critical heart" my comment was "many people take issue with the fact that the good of the Bible on several occasions ordered the Israelites to kill every man, woman, and child of other nations, not even giving them the chance to accept God. But it is clear that anyone raising such objections simply have a critical heart." Basically the point is to apply the point of the paragraph in such a way that it becomes obvious to anyone with half a brain that it's wrong.
Thee other method is to introduced information that the average jw does not have, then explain it away on an obviously flawed manner. Maybe something like mentioning a doomsday predictor like Harold camping in a negative way, then saying something like "of course the Bible students expected the end to come in 1914 and again in 1925, but we know that they were mearly driven by their zeal in expectation of the great day of Jehovah."