Do you tend to swear a lot? If so, what curse word(s) do you use the most? If you're not someone that swears a lot, do you substitute words like "shoot" or "fudge" instead?
Sometimes, I use the "polite words" instead of insults.
As I'm French, the most popular curse words are "putain", "merde" (the ones I use the most), but there are lots and lots other ones.