I have a condition known as "solder joint anxiety." This means that every single time I make a solder joint on a PC board, I'm absolutely, positively certain that THIS will be the joint that fails at a later, extremely inconvenient time. Every single one. If there are any existing solder joints I've made that haven't failed yet, it's because they're just waiting for an even more inconvenient time than now.
As far as I know, I've never had a joint fail yet, but that's because they're still waiting...