Scene: 2am. Mommy trying to fall asleep in bed. Isaac wide awake next to Mommy. Daddy fast asleep next to Isaac. Dog at end of bed, snoring.
Mommy: Oh man, the dog keeps farting.
Isaac: What did you say Mommy?
Mommy: Oh, nothing.
Isaac: (quiet for some time ... obviously thinking ... then...) Mommy, you know that when you say something and then you say that you didn't say something ... well, that is called lying.
Mommy: (smiling) You are right son. I just said that the dog was farting.
Isaac: (putting hand to my face and looking into my eyes) Thanks Mommy. Thanks for not lying.