Around the net there's been the ongoing joke or debate about the competition of pirates and ninjas. A few years ago some folks promoted September 19th as International Talk Like A Pirate Day. One might naturally expect there would be an International Talk Like A Ninja Day. Well, there is. But as ninja (or ninjas) are about stealth, they don't draw attention to this day. Or rather, these days.
Which days are these? All of them. The ninja just blend in and talk like everybody else. They might even talk like pirates on the 19th of September if that's what's needed to remain undetected in plain sight.