The sock goblins are the archenemies of the sock gnomes. Their role is to sneak into your house at night and replace all the socks the the sock gnomes have stolen. It has been noted that this never really equates to a full pair of socks. See sock gnomes
for more information. This phenomenon also applies to any missing object that one cannot find for days that suddenly turns up.
Aah... i'd been looking for this sock for weeks, the sock goblins must have brought it back... I wonder where the other sock is?