Audio illusion

Nice audio illusion from an episode of The Pulse on WHYY. You're first presented with a sentence we're told is real English, but has been turned into bleeping by a computer. After we've been played the unchanged original sentence, however, our brain is suddenly able to make complete sense of the gibberish version as well. According to the presenter, this is because our brain is constantly using old information to make sense of new events. 

Try it for yourself: