"Because it is an article of food."
"Why is it like a cream-puff?"
"Because the best part is inside."
"Why is it like cheese?" said Fannie, putting a piece in her mouth.
"Because it comes on with the dessert."
"Why is it like a book?"
"Because the best part is usually between the covers."
"Why is it like a ring?"
"Because people like to have a finger in it."
At which there was a general shout, and they all said: "A pie, of course!"