"I not naughty"

I was hanging out washing today and Alex was helping (i.e. playing with clothespegs). I have a couple of giant pegs for hanging things like blanket, etc and he was messing with these - putting them on his nose and stuff like that, when he dropped one onto the patio and it broke. "Oh dear" he says - I looked up and saw the peg was broken so I said "Did it break, then?" and he immediately says "I not naughty". "It's ok, Allie, you didn't break it on purpose" "No, I not naughty". It was very sweet...