Reading Harry Potter through for the 6th time, as near as I can calculate. Still just as good as it was the first time through, six years ago. Extra special this time because my fiance is reading them all for the first time... so I feel like we're at Hogwarts together. :)
I find that reading this series makes me happier and also helps me hone my writing craft. JK Rowlings is such a master of characterization, plot, humor, and narrative drive that it helps me think and rethink how I do my own writing.
(Speaking of which, I reached 25,000 words on "The Mermaid and the Unicorn" today. For reference, the typical novel ranges between 75,000 and 100,000 words.)