Kade got a sunburn a few weeks back, which peeled a bit. When he noticed he started screaming and crying saying his skin was broken. Then I explained that his skin was healing, and he was growing new skin, so it was ok that the old skin was peeling. And peeled a little piece to show him it was ok and he had skin underneath. Then he looks at me all serious-like and tells me sternly: "NO MOMMY! You don't peel your friends! That's not very nice! Say your sorry!" He proceeded to tell this to anyone who pointed out the peeling for the next few days, and for a week after that his skin was growing to anyone who would listen.
Also now his word is calories. "I love milk it's good for you, and has only 20 calories!"