In case you missed it from earlier this week, retired U.S. Congressman Barney Frank recently visited Big Think to discuss the rhetorical power of humor. If you want to persuade, make sure laughter is in your arsenal:
"[Humor is] a way to make your point that will A) break through the clutter and be remembered and B) make the other people nervous about it. And I do think the fact that I had a talent for effectively making fun of people made them a little nervous."