Shibboleths and passwords
If we had ever needed a shibboleth, two good ones would have been Bijou and Boradaile. The name of the county, or the town in it spelled the exact same way but pronounced differently, would have made good ones also. No one not from around there would ever have come up with the "correct" pronunciation. Anyone asked to use as passwords prominent features of the exact locale would have done well to mention one of these: Diamond Rock, Miami Beach, the Wall, the Snowman, the Boulevards, the car barns, the Sunset, or the bakery stables.