A childhood belief about swearing

My friend once told me that the legendary F word was, in fact, funk. I thought this was the grandest joke, because at my home we had an encyclopedia called Funk and Wagnall's Encyclopedia. I would look at these books and laugh, and my mother thought I was quite mad. Only later did I realize that that N should have been a C. But I still snigger every time I see one of those encyclopedias.