When you have small children (I imagine), you have to be careful what you say around them. They are just learning to speak and may seize on any word and repeat it unpredictably. This happened to a friend of mine who somehow managed to say “scrotum” within earshot of his small son. The word subsequently turned up in various inappropriate situations, to general hilarity. I’m sure this happens thousands of times a day, all over the world.
I’m not sure of the context for my friend’s “scrotum” — when you’re annoyed, all kinds of expletives can just pop out. Of course, this won’t be a problem for me, because I don’t know any rude words (except “scrotum”, and I will be careful to avoid using it gratuitously). But for the rest of you, I am compiling a list of swear words that you can safely say in front of even the most parrot-like three-year-old.