I hope this isn't too off topic..

Okay, a good question.

Whats your favorite book in the HP series?
Whats your favorite chapter in the HP series?

For me:
Book - The Prisoner of Azkaban
Chapter - Christmas on the Closed Ward (OotP)

I cried .. a lot in that chapter.. Neville is like my favorite character, I just wanted to hug him till he pops. Poor Neville. Awe.. AWE!