My Medieval History Professor in grad school, who was a former Lutheran Pastor, once told me a story about a time he was having dinner with one of the families from his congeregation, and while having a conversation with one of the teenage children, he responded to a question to which he did not have an immediate answer with "Oh... gee, I'm not sure."
Later the parents had a quiet word with him about "swearing" in front of their children. When he ask what they were talking aout they said "Gee" is short for "Jesus", so he was talking the Lord's name in vain.
Thinking that the was ridiculous -- as any reasonable person would -- he said, " 'Gee' is short for 'Jesus'? Well fuck me!"
Fortunately, the parents broke out laughing at that point... they were putting him on. But apparently their parents really thought that "Gee" and "Gee-whiz" were swear words!