Two students at Cambridge University in England raised more than $40,000 toward their university tuition by wearing business logos painted on their faces for a day.18 Dunlop the tire-maker, however, went to the extreme by offering a set of free tires to those who would have the company's flying-D logo permanently tattooed somewhere on their bodies. Ninety-eight people complied.19 Is it ethical for advertisers to resort to such promotions dubbed "skinvertising"? To what degree do you find such messages effective? Would you participatewhy or why not