We bought a house from an elderly lady; she moved about five hundred miles away. On day shortly after a man knocked, looking most apologetic, said his aunt had sent him, and would we let him have the 'yellow rug' from the kitchen that she had forgotten to take? This was mysterious, until we suddenly realised that she meant a small, plastic doormat, about eighteen inches by twelve, that must have cost about £1.50 in those days. He was apoplectic; the petrol must have cost him about ten times the price of buying a replacement mat.