Three female cats were bragging about their kittens.

The first cat said, "My kittens are part Persian. Their father was a pure Persian cat."

The third cat said nothing.

The second cat said, "Well, that is nothing. My kittens are part Siamese. Their father was a pure bread Siamese."

The third cat still said nothing.

Then the first two cats asked her,"What are your kittens?"

She replied, "Oh, I don't know. I had my head stuck in the tuna can at the time."