My 3 year old came home from daycare appalled because a kid in their class had said a bad word.
I asked what the word was.
“I can’t tell you. It’s a Bad Word.” (Big ol’ eye roll. My child. It had already started.)
I said “I’m not setting you up to get in trouble. And you aren’t saying the bad word if you are just telling it to me. It’s OK. I promise.”
“It was the S word.”
“He said ‘shit’?”
“No-o-o.  He said (deep breath and portentous pronouncement} ‘Shut. Up.’”