In a major Northeastern university, which shall remain nameless unless of course you know the territory, undergraduates generally use the John D Rockerfeller Library. Or at least they did so before computers were so rampant. It was thus common for arrangements to be made to "meet you at the Rock."

The Administration didn't approve. Disrespectful, they said. And so a decree went out that the aforementioned Library should not be referred to as "the Rock" any more.

And so it came to pass. The undergraduates obligingly changed their custom, and instead arranged, "I'll meet you at the John."

Needless to say, the Decree was quickly rescinded.