Little Joe has a very big imagination. When his mom takes one look at his room, she realizes he didn't clean it before going outside to play. Little Joe quickly comes up with a story and weaves a tall tale that he is sure will get him off the hook. Your little ones will love the humorous twist that even Little Joe didn't see coming.
If my son made up such an elaborate story to get out of cleaning his room I'd be impressed. I wish the kid in the book didn't have so many toy guns, though.