The kid didn't want to wear underpants today. I'm not going to push it. He did, however, call my to his bedroom after he was tucked in for the night to tell me he had made a deposit in his diaper. Actually, it went something like this:
Sam: "I have something special JUST for you!"
Me: "Sam, do you go poo-poo in your diaper?"
Sam: "There's no poo-poo in there. There's a toy in there!"
The three-years-old and into potty humor all ready.