Casablanca (1942)
"Louis, I think this is the beginning of a beautiful friendship. And maybe more..."
Actually, the credit goes to the editors who knew exactly where to cut, or when to put a soundtrack loud enough to cover the rest of the sentence.
Now, exclusively, here are the classic movie quotes as you should have heard them if it wasn't for the editors' foresight, regardless of the ridiculous impact they would have on the film had they been kept, which one do you find the most interesting in a funny or not-so-implausible way?