After the first movie came out, I bought the first book in French to try to make myself practice but kept getting hung up on words like muggle. Then after I think the third movie, I read all the ones up to that point then would read the next one right after seeing the movie. I let a friend spoil me for book 6 because she'd finished it the day it came out & was dying to tell someone. But I didn't know anything about book 7 til the movies (even though my bff bought me book 7 right before part 1 came out) but got spoiled about Snape on tumblr.