Superfluous thong

Normally found in Australia at festivals, on the side of the road, at a bus stop or in the middle of the desert. One of a pair of thongs, the most common of all Australian footwear and always there is only one... No one ever knows where the other one is. Common Australian beleif is that every now and then a thong gets sent back through space and time as an exchange for all the socks that dissapear...