Humor is often a good way to get a point across. For instance, here's how Lewis Black gets his points across about milk and water:
http://www.youtube.com/watch?v=tXS5GBuk-GQ
Humor also has its own way of being persuasive by rendering ridicule what a lot of people accept as the truth. Try to convince someone that consuming vegetable oil or grains is bad with logic and data is another ball game and not always apropriate.
So, for all Paleo enthusiasts out there, what are the best jokes you know that show without a doubt how absurd it is to be eating like we do in the Western world?
Here's one that was posted in a museum about aboriginal people in Canada:
How do you call a vegetarian indian? A lousy hunter.