Frisco

NOBODY in who lives in the Bay Area calls San Francisco "Frisco". Only some lame ass tourists who want to sound local say Frisco and everybody who lives here knows that. We call it The City, goddamnit! If you say "Frisco" to a local, they will know you're a poser.

Emperor Norton once proclaimed "Whoever after due and proper warning shall be heard to utter the abominable word 'Frisco,' which has no linguistic or other warrant, shall be deemed guilty of a High Misdemeanor."
The penalty for this crime was $25, which in that day was a whole lot, since even today, it's no laughing matter.