Well, I was reinstalling OS X, and my dvd would get to the end, and the pop out, saying that something was wrong. I looked at the disc after the third try, and lo and behold, it looks like someone breathed on it, but it wont go away. I tried washing it with solutions, soap, joy, windex, and out of desperation, lysol, it has not gotten any worse but it is no better, see the photo for a visual.