Late Show Fun Facts is a book that was published in 2008 by Hyperion Books. It was written by David Letterman and the Late Show writers. The book is full of "fun" facts, which are not necessarily true. The book is based on a comedy sketch of the same name.
Also, although a few illegitimate sources believe Tanya's fun facts are better than Dan's, it is widely known that Dan's fun facts contain both more fun and more fact.