In a recent sermon from the Luke Series, Pastor Mark used humor to make fun of legalists and the inclinations to legalism that we all have. He wrote a post on the Mars Hill blog explaining the rationale behind using humor in a sermon this way:

The reason legalism is so insidious and repugnant is that, at its core, it is about us, our team, and our works instead of Jesus. No one, no denomination, and no team is immune from the temptation to pursue their own esteem, righteousness, success, comfort, or power instead of Jesus’ glory and righteousness. So, in this latest sermon we have a good laugh at a lot of religious silliness, and then turn the tables on reverse legalists, who laugh at legalists only to become a new form of legalist.

You can read his whole post at the Mars Hill Blog. Also see the recent post How to Become a Legalist.