"You cheated!" "Pirate."
When I was teaching English to a bunch of French teenagers, I usually did at least one Talk Like A Pirate Day. It was never in September, what with the school year not really even starting until October. It was how I taught the kids the correct pronunciation of the American R. I found that a Frenchie trying to do a pirate RRRRR ends up sounding like an actual Anglophone, rather than a Frenchie who can't make a proper R sound. We'd start by watching a clip from Pirates of the Caribbean: The First of a Series Cursed with Mr Gibbs (the Black Pearl first mate) talking, and then we'd play a couple of games centered around pirate jokes. The exaggerated arrrrrrr was great practice for the kids.
The thing is, I showed them Jack Sparrow not because it was my first choice, but because I knew they already liked the film and it would keep their attention. I was fairly certain they wouldn't find my favorite clip funny. It's old (ancient in internets years), but it still makes me laugh. Enjoy your Nineteenth of September celebrations!