You know you’ve always wanted to be a ninja. So why not attend Ninja School? Very, very, very funny. Here’s a line from the Ninja Etiquette section:
Never show your real face. If you must show a face, it should be a very shiny mask. This is the only possible substitute.
Of course, once you are a ninja, you will need a proper ninja name. Mine is "Pissed Tiger".
Update: If you're interested in all sorts of Ninja stuff, check out Pirate Monkey Ninja.