Redshirts was completely unlike anything I expected, even as I got into the book. A new ensign, assigned to the fleet's flagship, soon realizes something is wrong. People are constantly getting killed on away missions.
He investigates, and runs into an amazing theory, which I don't want to share, but it had me smiling and chuckling a few times as I got halfway into the book. If you like sci fi, and want something that's not too serious, give this a try.