When giving a persuasive speech regarding purchasing an item, is it appropriate to use humor in the introduction and in conclusion of the speech?

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Humor is one of tools available to the essayist/rhetorician and as long as the effect of humor (light-hearted emotive response, undercutting a pseudo-serious subject, exposing false logic, etc.) fits the topic, humor is appropriate.  When your essay is seeking to convince the reader to buy something (and in a sense all essays are sales essays), you naturally express its qualities; the question is really how fruitful (or damaging) is the act of denigrating competitors with humorous comparisons or criticisms.  On the other hand, you want to put the reader in a good sympathetic mood toward your product.  Ask yourself what function you want your humorous speech-act to perform.  Also, be sure you are still introducing or summing up your  "pitch".  One final note:  judge your audience, and judge the seriousness of the product.