Tonight I walked into this. His destruction of the roll of parchment paper was accompanied by his singing of Twinkle Twinkle Little Star, his current favorite song. Again, it's hard to be mad when he's just so cute.
Calvin isn't a big eater. He's picky and overall just too busy to be bothered with it. I think this is how he stays alive. He climbs onto the counter, takes a bite or two of an apple, and then puts it back until next time. He's careful never to eat the same spot twice (probably because it's brown and gross), but he loves that he can just nibble off what he wants and then move on to something else.