A strandloper in Scheveningen, once a shibboleth

A man walks along the beach at Scheveningen, which is a district of The Hague. There is anecdotal evidence of the name Scheveningen being used as a shibboleth during World War II to identify German spies: apparently they would pronounce the initial "Sch" differently from Dutch native speakers.

Definition of the day: A shibboleth is a word or custom whose variations in pronunciation or style can be used to differentiate members of ingroups from those of outgroups. In this instance, I'm in the outgroup.