My new favorite sound is Joe carefully sliding his tiny fingernail under the little cardboard flap in one of his lift the flap and learn things books, the little FWIP of the opening of the flap, cardboard coming away from hard paper. My second favorite sound is Joe RIPPING OFF THE FLAP WITH HIS FULL HAND, experimenting with the limitations of his own power, crushing the flap in his tiny palm, then returning calmly back to the book. Fwip.