4. Jewellery Falling Out And Never Being Seen Again
This is an especially big potential problem just after you get a piercing. Getting a slight knock, having a shower, any kind of physical activity - all these can result in you suddenly releasing there's no metal where there should be, and now it's lost forever. If this does happen, you'll start getting paranoid that the hole may close up if you don't quickly get some more jewellery into it.