“I should like it very much,” said Alice, “but I haven’t been invited yet.”
“You’ll see me there,” said the Cat, and vanished.
Alice was not much surprised at this, she was getting so used to queer things happening. While she was looking at the place where it had been, it suddenly appeared again.
“By-the-bye, what became of the baby?” said the Cat. “I’d nearly forgotten to ask.”
“It turned into a pig,” Alice quietly said, just as if the Cat had come back in a natural way.
“I thought it would,” said the Cat, and vanished again.

Alice's Adventures in Wonderland, Chapter 6 - Pig and Pepper