The episode called "The Sinner", the young pastor Matthew Fordwick is staying with the family, and he's a ridiculously zealous preacher who scares the family with his fearful sermons. I think the overall funniest part is when the newcomer reverend goes with Zeb to a "harmless" sit in with the Baldwin sisters, not knowing that their "recipe" is whiskey! And then he becomes drunk, of course, and goes to his first sermon!
Rev. Fordwick: What do you think of my sermon?
Don't worry Jim-Bob, it will come back to haunt him.