My children, surprisingly enough, haven't picked up on as much as I thought they might. But when they decide to use those forbidden words, they make sure it's in full hearing range of...oh... clergy, teachers, other parents, you know, the people I really want them to be on their best behavior for.
My youngest's favorite word happens to be 'shit'. He thinks it's funny to see my face go purple, eyes bulging, steam from the ears.
I guess I have myself (and my husband) to blame. Shit!