Knock Knock says it, so it must be true: everybody lies. If they say they don't, they're lying. Scientists have proven that excuses and lies have played a role in our evolutionary survival, so the question isn't whether to lie, it's how. Hope you've got some good ones. Lines for All Occasions are hardcover books written by Knock Knock. Each measures 3.5 x 5.75 inches and is 100+ pages long.