I wonder if the Shibboleth/Sibboleth thing was dialect difference or an accent problem. Since Sin and Shin are basically the same letter, maybe it came down to a skedule/shedule difference, with a regional preference. After all, the Ephraimites understood the instruction, "say Shibboleth", and thought that they were complying. I'm sure that Australian Social Welfare officers will now use a similar test for welfare reciipients, to weed out Kiwis: "Say, 'fish and chips'" (trans-Tasman-in-joke-emoticon)