8 Obscure Background Movie Clues That Explained Everything
3. You Can Actually Hear What Bill Murray Says - Lost In Translation

"Let's never come here again because it would never be as much fun," is my favourite quote from Lost In Translation. Delivered with almost absentminded insight, it's a wonderful summation of the film's exploration or longing and regret, hanging over the whole thing like a Suntory-induced hangover. However, it's only really my fav because nobody aside from Bill Murray and Scarlett Johansson knows what the most important line from the film even is.
At the end, just as Murray's successful-but-empty actor prepares to leave Tokyo for Japan he spots Johansson's equally-lost soul in a crowd and they embrace one last time, where he whispers... something... in her ear.
What is it? Who knows - the line wasn't in the script, instead created on the spot by Murray and kept purposefully ambiguous to leave the audience aching for for more just like the characters. Except, there is actually an answer (still doesn't topple my top quote though).
The words Murray spoke are actually in the background of the sound track and, with some clever enhancement you can make out that he's saying "I have to be leaving, but I won't let that come between us." Awwww.