The DVD rental place across the street from my apartment seems to put some sort of sticker on the underside of some of their DVDs, right around the whole in the middle. It isn't covering the readable surface of the disk, but it makes my PowerBook not like them one bit. When I put such a disk in it tries 3 times (if memory serves) to read it, then just spits it out. So far I've been unable to watch both The Assassination (with Sean Penn) and Supersize Me, because of these blasted stickers (so far, the failure rate is 2/5). I think I might send them an email about it actually (as it's an automated affair which are very common in mainland Europe)...