Red: Surprise! This ought to keep you company during the week.
Kitty: Roy's Pet Store? Red, you got me a cat.
Red: Well, it's like a cat.
Kitty: A fish? Red, it's a fish.
Red: See? It's like a cat. They're both pets.
Kitty: No, they're not. Pets are called "pets" because you pet them. How do I pet this thing?
Red: Well, you just reach in and corner it and give it a rub. That's the thing about fish: They just love the feel of the human hand.