View Post Agencies | Brands | Campaigns | TV McCann Oslo Follows Up ‘Grandpa’s Magic Trick’ with Sentimental ‘Snowball’ By Erik Oster on Feb. 18, 2014 - 11:48 AM McCann Oslo has just released the follow up to their popular 2012 “Grandpa’s Magic Trick” spot for Wilderoe Airlines, with the new sentimental effort, “Snowball.” The 55-second spot documents a long-d ...