Mars, inc., makers of snickers candy bars launched its you're not you when you're hungry promotion campaign. the company's television commercials portrayed regular people disguised as celebrities behaving badly because they were hungry. along with the commercials, print ads were released featuring inversion illusions showing the difference between someone whose hunger is satisfied and someone whose hunger is clearly not. in addition, the print ads included a coupon for a snickers candy bar. this type of promotional strategy is referred to as