The Cat in the Hat is a children's picture book written and illustrated by Dr. Seuss. The Cat in the Hat knows a lot about that. Although it is unclear what that is. Is "that" the book The Cat in the Hat? Or is "that" some other unknown object existing in the minds of Sally and I. Whatever the cat knows, it seems one must become the cat to know it. Alternatively, we could just look up the book of the same title, The Cat in the Hat Knows A Lot About That! and read it to find the answer, but that would ruin the sense of suspense. Also, everyone knows that you don't find answers in books; you find them Blowin' in the Wind.