What could be as tough a job as being a mum? Being a Dad of course. American Greetings' Cardstore and Mullen have followed up their heartwarming Mother's Day ad, "Toughest Job in the World" , with a Father's Day addition. While the previous effort set up an interview for a fake job, this time the brand set up a fake casting call for actors to play Dads; they weren't told the job had anything to do with American Greetings. The ad shows clips of the auditions, before telling us "In real life, there's no script for being a Dad."