Philosophers have long wondered why socks have this habit of getting lost, and why humans always end up with large collections of unmatched odd socks. One school of thought says that socks are very antisocial creatures, and have a deep sense of rivalry. In particular, two socks of the same design have feelings of loathing towards each other and hence it is nearly impossible to pair them (e.g. a blue sock will usually be found nestling up to a black one, rather than its fellow blue sock).
On the other hand, quantum theorists explain it all by a generalized exclusion principle -- it is impossible for two socks to be in the same eigen-state, and when it's in danger of happening, one of the socks has to vanish. Indeed the Uncertainty Principle also comes in -- the only time you know where a sock is, is when you're wearing it, and hence unable to be sure exactly how fast it's moving. The moment you stop moving and look at your sock, it then starts falling to pieces, changing color, or otherwise becoming indeterminate. Either way, socks may possess Color and Strangeness, but they seem to lack Charm.