Don't even get me started on magnets. When I was younger I used to play with those little wooden trains that you'd build the track for (and let's be real, I still play with them now occasionally). So I'd pick the front train and then I'd choose 3 carriages to go with it, and then I'd have to attach them together. Every time I tried to put two together, they'd always be the wrong way round and the magnets would repel against each other and it was just the most annoying thing.
Another thing is that sometimes the magnets don't even work. Like fridge magnets for example, you'll have an awesome fridge magnet that's got some quirky thing written on it like "chocolate is always the answer, it doesn't matter what the question is" (one of my personal faves) so you're like, "yeah this is gonna look so cool on my fridge" and you stick it on at the top and then off you go to school. You come home to find the fridge magnet right at the bottom. Companies who make magnets, if you're gonna make magnets, make them stick. No one likes a sliding magnet!!
Something that's always annoyed me and probably will forever, is the fact that they can't filter what the pick up. Obviously they can't help that, but it's still annoying. I've had it before, where I have a pot of paperclips and safety pins and I want to only get the paperclips, but you can't just use a magnet to puck them out because they have no filter so they'd just pick up the whole lot. Remind me to never put two things that are magnetic together in the same pot...
Okay Shay, there's my rant on magnets! Your topic is CD cases (good luck with that)