I know how that goes. I try to talk to someone and if I pronounce something differently than they do in the movie (Currently the big ones are Earendil, Shelob, Gamgee) then they try to correct me. And the argument on their side is "Elijah can't be wrong with the way he pronounces it so the book is wrong."
In a way I am grateful for the movies because, even though I hadn't seen FotR, one of my friends had and loaned me the Hobbit.
