“How did Southern Californians come to treat their highway route numbers as if they were proper names?”
I can’t say how delighted this native Southern Californian was to read this (and especially to rediscover the classic SNL skit). Despite living in Rhode Island, I retain this linguistic quirk that I subconsciously learned as a kid growing up in Southern California. This is a shibboleth of mine, a distinctive pronunciation, word choice, or manner of speaking that reveals something about the speaker (such as place of origin, ethnic background, or group membership).
Questions to Ponder: What are other shibboleths that you know? Do you use any?