I always worry that if I begin cursing, I won't be able to stop. Also, the English language is so... inventive, it seems like an insult to go to a certain fiery place, as opposed to telling them that you wish vultures would feast on their innards. (I know that, in that case, you are trying to insult the person... but I find the other way more fun.) There's a quote that I can never get quite right... "Profanity is the sign of an inarticulate mind trying to express itself." I think that's a mean thing to say, but sometimes quite apt.
Hehee, apparently I'm kind of like Bastet, it seems, in that, when I do feel the need to curse, I take my curse words from other universes. "Frell" from 'Farscape' and "smeg" from 'Red Dwarf'. The only time I've ever 'taken the Lord's name in vain' was by instinctivly combining these when I realized that a roller coaster I'd reluctantly agreed to go on was much higher than I'd though. According to my sister, the loudest phrase one could hear, as the coaster began to drop, was "God, Jesus, frelling smeg!"
I informed my father, who was sitting behind me at the time, that it was a type of prayer. And I suppose it was... just a very involuntary one.