You'll NEVER guess who's coming to visit you! Cocka Who is full of surprises, laughs and even some learning along the way (but much more fun than school!) Now let's find out who's knock knocking on YOUR door! Cocka Who is a unique Australian variation on the fabled " Knock Knock" theme. Interactive and full of laughter, love and more than a few Dad jokes, Cocka Who? was inspired by the bedtime story author Adam Walters made-up for his daughter when she was a three-year-old. His jokes have now exploded into colorful life with the beautiful illustrations of Adelaide artist Morgan Ingerson. Enjoy!