I just went to let Z out of his room from his afternoon quiet time. He opened the door all happy and bubbly and talking in Z-speak, which is to say lots of unintelligible words with a little English thrown in for seasoning, but buck naked. I interrupt Z-speak to say, "Where's your diaper?" His response, perfectly clear, appropriate tone of voice and everything: "Oh. Took it off." as he went and got it for me.