Justin Moore’s Daughter Tells A Bunch Of Bad ‘Knock Knock’ Jokes …while eating a bowl of blueberries, four year-old Rebecca tells several ‘Knock Knock’ jokes to Justin and her siblings. View this post on Instagram Klein doesn’t quite grasp the concept of knock-knock jokes yet, but an A for effort 😂 A post shared by Justin Moore (@justincolemoore) on Nov 19, 2018 at 5:17pm PST