As you all know, my official occupation is "Corporate Ninja" and today we celebrate all Ninja-kind with Day of the Ninja. See the video below for a historical enlightening about the Day of the Ninja.
Also if you would like to know how clever the Ninja are in general, go to www.askaninja.com.
Episodes you must see first:
Ask a Ninja: "Ninja Omnibus"
Ask a Ninja: "Pirates of the Caribbean"
Ask a Ninja: "Ninja Colds"
(Many thanks to Keith for the enlightenment.)