"There are many ways to exercise promotion and public relations strategy. One way is to use humor to promote your product. Discuss a promotion that uses humor to achieve its goals. (such as an ad or other promotion). One challenge of a humerous ad is that the humor can overshadow the core message of the ad. How does your example avoid that challenge?" 1 page write-up to cover subject is fine.
NO word limit - but cover subject...list sources please (MLA style)