The sixth format is “benefit causes story.” You conceive the ad back-to-front, by imagining a trail of events that might be caused by the product’s benefit. In the example Gunn uses, a man on a safari screams when a lion charges him. It’s then revealed, to the amusement of the man’s friends (and also the viewer), that he’s been looking through the powerful zoom lens of his Olympus camera. The lion is, in fact, hundreds of yards away.
Excellent walkthrough from slate.com
