Cautionary Tales
My kids love these books. They are the "Cautionary Tales" set from Usborne books, which includes: Say Please, Louise; Don't Be a Bully, Billy; Don't Tell Lies, Lucy; Don't Be Greedy, Graham; and Give That Back Jack. They have a hilarious way of teaching values and each main character faces some funny consequences at the end of each story. I don't want to giveaway the endings, but Billy does have an encounter with a spaceship. :)
