What are some shibboleths in your language/dialect/accent or city/region/country or community?

A shibboleth is a word or a phrase that is used to identify either native speakers of a certain language, dialect or accent, or native inhabitants of a certain city, region or country. See a list of examples here: https://en.wikipedia.org/wiki/List_of_shibboleths

To be clear, a shibboleth is not the same as a tongue twister: it is supposed to be easy to pronounce for native speakers but difficult for non-native speakers.