 Variants include, a Halloween skeleton variant, a Christmas hat variant, a mini version, and hats to advertise the Whopper, Chicken fries and the 2019 Melting down promotion.On 12 September 2007, Burger King announced that it was joining the Council of Better Business Bureaus Children's Food and Beverage Advertising Initiative.The program, a voluntary self-regulation program designed to adjust advertising messages aimed at children so that they encourage healthy eating habits and lifestyles.