Removable nose

Isaac was lying in the dark, trying to fall asleep, and I was sitting next to him.

"You can't take off your belly button," he said.

I said, "What?"

"It attached to your belly," he said.

I said, "Oh. Yeah, that's right."

"You can take off your nipple," he said.

I said, "No, nipples are attached too. They're part of the body."

"Daddy can take off his nipple," he said.

I said, "Nope. Nobody can."

"Daddy can take off his nose," he said.

I laughed and said, "Oh, is that right?"

A minute later later he said dreamily, "Mr. Potato Head."

I didn't say anything, but I could follow his train of thought -- Mr. Potato Head can remove his nose (although he doesn't have nipples or a belly button).

After another minute had passed, he said, presumably still thinking about Mr. Potato Head, "You can take off his hat. Just like Isaac can take off his hat."

All this was interesting, but it didn't really help him fall asleep. He's still awake now, nearly an hour after this conversation took place.

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Edited to add:

Now that I think about it some more, Isaac's first statement was really something like, "Your belly button don't come out."