The Sponge?

So a minute ago, Drew was looking at a Christmas mug I got from my friend. He said, "I take this in my room, ok?" I told him he could, but to be careful with it. He picked it up, and it made a noise. He looked inside and gasped in apparent delight. "A sponge?! A crayon and a sponge." It is actually chalk, but who's counting? I said, "just put that stuff in the basket and you can take the mug with you." He said, "No, I keep it in. Maybe I'll take it out later, ok?" and he wandered off, saying, "The sponge, the sponge, the sponge..." in a sing-songy voice. Who knew a sponge could make his day so bright?