THE TALES OF BEEDLE THE BARD ...

Is a collections of short stories written by J. K. Rowling shortly after she completed writing Harry Potter. They are a collection of fairytales set in the Harry Potter universe and include humorous annotations from characters within the world. Interestingly Rowling illustrated the book herself and there were special leatherbound copies produced for friends that went up for auction before a commercial edition was published. Here is a comparison:

                  © J. K. Rowling                                                 © J. K. Rowling

Each fairytale is fun or scary and they are all very enjoyable with or without their connection to the Harry Potter series as a whole.

Here is a link to the book on amazon.