Our eyes listen?

I downloaded this video years back. I don't remember where from. This is a very unique video. When you listen to it first time, look at the man's face or mouth. What do you hear? Then replay the video. This time close your eyes and listen. What do you hear?

Yup, you hear two different things. No trick here. It's the same video that you listened to both times. Amazing isn't it? You can actually fool your mind.