Had to Share

So I was coming home from work last night, riding on the subway, when I noticed a guy sitting and reading a book. Now...this is not normally a weird thing. But the guy was around my age (mid-twenties to mid-thirties), pretty normal looking, and he was silently laughing to himself as he read. What book was he reading??
Hmmmm....

And it's the NINTH book in the series!! Do you think he's read all nine???