1) CDs that skip or are otherwise messed up. 2) When a CD skips during your favorite part of your favorite song. 3) People that wipe CDs with their shirts, but not as much as... 4) People that lick their fingers, wipe them on the surface of the CD and THEN wipe it with their shirts. 5) People who leave CDs out on on messy desks and balancing precariously on dusty TV tops. 6) People who borrow my CDs and do that to them. 7)When you have a rare CD that is out of print, and it starts to skip. 7) People who stack their vinyls horizontally, letting them warp. I find my severe dislike for people who do this is similar to the reason that authors want people to use bookmarks, not just dog-ear the pages. I find it disrespectful to the artist and just plain irresponsible. In addition, I whole-heartedly support people who only buy vinyls, as vinyl sound quality is far superior to CD sound quality. If vinyls weren't so big, and I could listen to them on the go, I'd have more of them.