It turns out: you're saying it wrong.
I quote movies more than just about anyone I know. That's saying something because I have out with a lot of fellow film buffs. Unfortunately, some of the most recited lines that we think we know, we don't really know so well. Some of the corrections on this list are pretty nitpicky -- if that's a word - but we've been way off on a few of them.
Side note: I may or may not have used one of these quotations -- correctly, I might add -- as I went in for a colonoscopy. I'll let you figure out which one. Dr. Butz was not amused.