As if it weren't hard enough to dissuade your children from billboards and television ads touting fast food, a new tactic has entered the ad world. Fast food chains in Australia have begun emailing free-food vouchers to kids under 12. But could it happen here?This "direct mail" marketing campaign from Australia-based chains Hungry Jack and Taco Bill strategically bypasses parents with an online "Kids Club," where children can register to receive "free meals on their birthdays, vouchers for free ice cream" and finger puppets, reports The Daily Telegraph.