Mommy picks Max up from preschool - this is in the car coming home:
Max: Mom, I said naughty words in preschool today.
Mom: Max! What did you say?
Mom: Why?? Don't do that buddy.
Max: Nobody heard me.
Mom: Oh... okay well don't do that again, alright?
The next day:
Max: Mom, I said naughty words in preschool again.
Mom: Max!! What did you say this time??
Mom: Buddy! Please don't do that!
Max: No one could hear me. I whispered it super quiet like this - "poo"
Mom: (trying not to laugh) K please don't do that anymore bud.
A few days later:
Max: Mom, I said bad words in preschool today. Even badder than pee and poo.
Mom: (incredulous) Dude! Why do you keep doing this? What did you say??
Max: (points down to his crotch and makes wide eyes)
Mom: (I'm already laughing at this point) Max!!! What the heck!
Max: I said it in my head.