They do not want people in Frisco oops,make that San Francisco to forget the first and only emperor of the United States.

VOA: special.2009.12.14

I went to see a rich girl I knew. In the morning she pulled a hundred-dollar bill out of her silk stocking and said, "You've been talking of a trip to Frisco. That being the case, take this and go have your fun." So all of my problems were solved.

我去看望我以前认识的一位有钱的姑娘,到了早上，她从丝绸钱袋里取出一张100元的支票说：,“既然你那么向往到圣弗兰西斯科的旅行，拿着这个去寻找你的快乐吧“，这下我的问题全部解决了。

耶鲁公开课 - 1945年后的美国小说课程节选

Even today many citizens of San Francisco warn visitors never to call the great city Frisco.

VOA: special.2009.12.14

They call it Frisco.

VOA: special.2009.12.14