About 2 months ago, Coen picked up the F word (not exactly the word we were hoping he'd repeat, but here we are). It was something that was used in a car (because someone was out of line) and any time he repeated it, it was used in the car.
After a few rounds of, "do not use that word", "that's not a nice word", "Coen, do not say that word", etc... It started to happen in my car. After a few rounds of the same sort of discipline above, I decided to tell Coen that it was daddy's word and that he wasn't allowed to say it.
That seemed to be the ticket, until I hear him say, "F&*^. Daddy's. Don't Touch."
I like to refer to that as a "Mommy Moment FAIL."