For years, I have carried around with me a single argyle sock. I have faithfully packed and unpaked it through many moves.
Why the single sock?
I liked the pair. I've always hoped that the second would someday show again, and then I could wear them together once more. And so I keep the one. Year after year after year.
The pessimistic side of me says it was time to give up hope long ago. But still I keep the sock.