I guess the best question that made them really really think about evolution was this:
Why do people have toes (fingers) on their feet? Some of them said, oh it is easy... toes help us walk. But I replied that best galopers (horses) don't have toes, if our feet were not remanents of apes feet, we would have been born with hooves?
I showed them a picture of some shoes and how the front of some of them looked more like a horse hooves....
They were (as always) speachless!