<p>I think a funny or satirical essay, even one that uses humor all throughout, can theoretically be fine. The problem, from what I've read, is that the great majority of people really <em>can't</em> pull those off! As for the vampire Jehovah's Witness, although it's hard to say without reading the whole thing, my inclination is to say not to use it for just the reason you mention. Taking a risk is one thing, intolerance is another.</p>