From blogspot.com:

Thought you might like to try reversing the audio in the scene with Karl strapped to the chair in Room 23. There is a backwards message in the first half of the film (this is a technique called “backmasking”). It’s a woman repeating the phrase “Only fools are enslaved by time and space”.

Link

If you’re a fan of the TV show “Lost”, like I am, you’ll find this cool – and creepy. Actually it’s cool to watch even if you’re not a fan of the show.