"I suppose so," said Alice.

"Well, then," the Cat went on,
"you see a dog growls when it's angry, and wags its tail when it's pleased.
Now I growl when I"m pleased, and wag my tail when I'm angry,
therefore I'm mad."

"I call it purring, not growling," said Alice.

"Call it what you like," said the Cat.

Lewis Carroll