Description from original post (created 2011-11-07 21:09):
A sock puppet is a puppet made from a sock or similar garment. When the manipulator fits a hand into the closed end of the sock, the puppet can be seemingly made to "talk". The puppet's mouth is formed by the region between the sock's heel and toe, with the puppeteer's thumb forming a jaw. At a minimum the shape of the hand will instantly form the shape of a mouth, but sometimes the mouth is padded by putting in a fairly hard piece of felt (often with a tongue glued inside).