View Post Ad Biz | Agencies | Brands | Campaigns | Digital | What The?? PKT Tests ‘The Effects of Halloween Candy’ on Kids for Crest By Erik Oster on Oct. 29, 2014 - 3:36 PM Publicis Kaplan Thaler has released a new campaign for Crest testing “The Effects of Halloween Candy” on children. The test is performed by a deadpan moderator who basically lets a group of children in Halloween costum ...