According to our research, it's a black hole in the washing machine.
Or maybe it's just your sibling's evil plot to drive you crazy?
We're still investigating...
But in the meantime, here are some Socks of the Year to keep you occupied.
Or, if you're feeling particularly adventurous, you can try to learn the art of Sock Sleuthing for yourself.
We're not responsible for any missing socks you find... or don't find.