Sod's law of earrings

So why is it that when you lose an earring, it's always one of your favourite earrings? I've only lost 3 earrings in about the last 10 years, and all three of them were from favourite pairs. And it's not simply because you wear them more. I'm sure there's some cosmic punishment going on here. How come you can never lose one of the earrings from the pair that Cousin Thing gave you but you don't really like that much?