Avast!

Every September 19 people around the world celebrate International Talk Like a Pirate Day. It's been marked on all continents -- even Antarctica.

Why?

Because it's fun, it's anarchic. Its very whimsy -- trying to get everyone on the planet to talk like a stereotypical Caribbean buccaneer on the same day each year -- sets it apart from other holidays.

[source]. You can read more about it on the Talk Like a Pirate website. Arrr!