The Adventures of Tom Bombadil (re-read)

This one also only takes a couple of minutes to read but is fun for the most part. It talks about Tom's marriage and a few other short adventures before moving on to other poems written by Tolkien that are loosely placed inside the realm of Middle Earth.

If you're a completist, then this is one you should pick up. If not, don't worry. You're not missing too much.